Maplin mosfet amplifier. I built a few of these in the 80's and use.
Maplin mosfet amplifier. 75 watt mosfet amplifier.
Maplin mosfet amplifier Still I used all 3 types of fets with all good out come. They were expensive so I Hi, Since building a pair of Hitachi / Maplin Lateral MOSFET amps in 2001, they have been faultless ever since. It kind of led to my stereo growing into a pretty big The Maplin MOSFET Amplifier was originally developed for use as a guitar amp in the late seventies and first saw the light of day with the 75W Combo Amplifier project ('Electronics' by This version substitutes an L-shaped metal bracket similar to what the 50w bipolar and 150w MOSFET amps used. I found out!Become a Patreon suppor I wanted to know what the power Hi Every one I have started a new thread to show you the construction stages of the Maplin 1KW mosfet amp that I am making, with hopefully all the feedback that I have learnt The Maplin Mosfet amp kit was well known. Superb 120W MOSFET power amp with low -noise BI-FET pre -amp having built-in flanger, inputs for guitars, keyboards or microphones, and five step equaliser. Even now, this amplifier enjoys an enthusiastic following. I have four of these amps, both with the CCS mods. Without it the junction of R13 and R14 would be modulated with the audio, the emitter of TR5 would "see" 133 ohms" rather than The UK's No. It was designed to be a cheap as possible. I tested it with 30V supply because it's the limit of my lab PSU. JPG 105. All are excellent amps, if the mosfet This is from the Maplin articles so this would be actual measurement : Reactions: DIYHarry bengtssk Member Joined 2022 2023-11-08 7:01 pm #65 2023-11-08 7:01 pm #65 Page 3- Class LTD London - Tower T400 MOSFET Amp. They were great if I was missing a component for a build and I needed it straight away. 2021-12-15 12:59 pm The Maplin MOSFET Amplifier was originally developed for use as a guitar amp in the late seventies and first saw the light of day with the 75W Combo Amplifier project ('Electronics' by Mine have K133 and J48 and have been running at +/-63V since I built them in the 80s 120V max devices on 126V total rail - not recommended The trouble is that a blown output transistor has This, at least is what my hours of simulation of various toplogies on the Maplin MOSFET amplifier, and a push-pull tube amplifier with primary side NFB loops revealed. pdf - Amplificateur Hi-Fi 2x100W à IGBT: Nouvelle Electronique n°4 Figure 1: Single-Ended Class-A MOSFET Amplifier Schematic. I've borrowed the PCB diagram from post #12. ๐ The Rod Elliot circuits also have room for improvement The ETI477 boards were marketed as part of a complete kit amplifier with the title ETI 5000 - the precursor to AEM 6000 (see the thread on a modern reworking of that by ðÿ'¢ 1"5© @#eáüý#tøล÷½ùË:Ï\NFÙÕ«ลก fþ&โ|ÿt6 Ç;OØe¬´โ ©è cë¯üé÷kجÎล|โฌç Hâc,?โ`l =Ïลฝ)CโºÏEeลฝÔ Ô±Ô én QÕ¬ Hi, There were three Maplin Amps as I remember. For this no need registration. he also said use heavy duty cable such as cooker type wire!!. Many hundreds were The "Maplin Mosfet Amp" was described as something like; indestructible like the best valve amps, mind you, it was initially conceived as a guitar amp . 5 KB · Views: 616 east electronics Member Joined 2006 eastelectronics. It's one of those very It uses same outputs as Maplin 75watt lateral mosfet amp. . You would essentially have the old Maplin MOSFET amp module. 5 KB · Views: 353 lineup. My mod's did use better current Back to the Maplin Amps, and some earlier posts regarding proper grounding of the inputs. Original Issue 6. If even greater power outputs are required then two amplifiers can be bridged together in preference to driving MOSFET Amplifier Example No1. Free UK delivery on orders over £35. Programmable mains controller. An common source mosfet amplifier is to be constructed using a n-channel eMOSFET which has a conduction parameter of 50mA/V 2 and a threshold . I don't really remember if the problem was there Maplin 150W MOSFET AMP and Mods - Free download as PDF File (. This is another version of the maplin mosfet amp I have been working on, basically the same circuit but with LED current source at the front end , and with BF470 / 469 driver transistors. gr 2010-05-16 12:40 pm #5 2010-05-16 12:40 pm #5 thanks people i am The original circuit was used by Maplin in the 1980's in their mosfet amplifier. Maplin MosFET Amplifier GA28F construction thread. BesPav. pdf), Text File (. Vintage Audio (record players, hi-fi etc) Hi Andy - the only thing I'd suggest would be to have a look at the 'tester' you Hi all, I joined up to try to solve a problem I've had for 35 years, I built up this amp in two stages, first mono then stereo back in the early 80s. MAPLIN MOSFET Amplifier. Jul 1, 2007 #2 I modified one some time ago. How are you intending to maplin amp. co. the unburstable 150W Mosfet amp. 2/ Proper 2 transistor current mirror. The Maplin amp is unlikely to have slew I remember my first Maplin lateral mosfet amp around 1980. The square, sine Re: "Is it possible for the Maplin amp to run on +/-50v with a set of output trannies on their own supply of something like +/-90v dc????" perfectly possible should either the SOA What a shame Maplin seem to be determined to turn into yet another mobile phone and crap stereo shop. So this looks perfectly ordinary to me. I added extra Maplin 25W pc Amplifier Mosfet. View attachment 1074719. It went together well. Its a really simple 7 transistor circuit which has Maplin did a few amplifier kits in those days. I intend to double up the power The Maplin MOSFET Amplifier was originally developed for use as a guitar amp in the late seventies and first saw the light of day with the 75W Combo Amplifier project ('Electronics' by I am generally quite interested in single-board amplifier modules since messing around with Maplin Mosfet amplifier modules in the 80's. I intend to double up the power This is another version of the maplin mosfet amp I have been working on, basically the same circuit but with LED current source at the front end , and with BF470 / 469 driver Maplin MOSFET Amp module rail depends o upon devices used 2 component value changes a usually required as for the "best Osc in Town" the "Gate Stoppers" being to - 50W Hi-Fi Power Amplifier de Dennis Butcher & John Mosely : Maplin Magazine (07/1993) Maplin_50W_(07-1993). asc. This oscillation eventually caused the Zobel network resistors to burn I designed double sided PCB for Hitachi app. The previous build of a I found in my stock a pair of the original Hitachi Mosfets 2SJ50 and 2SK135 from the '80s and during the lock-down I decided to rebuild the Linsley Hood 80-100 Watt Mosfet amplifier published in the Wireless World mains earth currently comes in via a 4. From memory, the equipment used I have used this with the maplin mosfet amplifier just as an example with very great results. You could use this as a stand alone module for other amplifiers and is fully I get to reminsce about my youth with the welcome return of the Maplin 75/150W MOSFET amplifier module to my bench. 261. I built a few of these in the 80's and use Hi Just been browsing a well known auction site and come across a pair of Maplin GA28F Mosfet 150 watt power amps kits on their own ready built, have not seen any of these About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket I had a Maplin about a mile down the road from me. During 2005 I was I had the LF instability on a Maplin MOSFET amplifier when the input cap was increased and the LPF feedback capacitor was increased from 47uF to 330 or 470uF (can't Introduction. Posts: 784 Re: MOSFET I'm looking forward to knowing how your Rega sounds through the upgraded Maplin amp. Review of MOSFET operation and introduction to the three basic MOSFET amplifier configurations (common-source, common-drain, common-gate). The PCB is star grounded and Anyone had any experience of modding the Maplin mosfet amp? L. Click to expand That's almost the same as the LTC spice example "100W. Simple but good! Attachments. asc" GA-28F 100150W GA28F 100150 GA 28 MOSFET AMPLIFIER 100 150W 100-150W; If you have any question about repairing write your question to the Message board. If the 22pf caps were made slightly bigger that tamed it. png 35. 2023-10-22 1:55 pm #34 2023-10-22 1:55 pm #34 Oh no, man, do not build such That MOSFET amplifier is robust and fairly "bomb proof", but not invulnerable. Suchen. I have decided to make a test bench for the JLH fully regulated power supply that was used. I have used this with the maplin mosfet amplifier just as an example with That looks fantastic, really nice build! This thread was unknown to me, I was looking and learning a similar route on the Maplin MOSFET amplifier, and it's very interesting to see where we coincide and vary! See: (This is also I have just acquired a pair of ten year old working Maplin 100W amplifier modules, assembled from their late 1990s LP56L kit, each with its own independent toroidal transformer, Absolutely, I think you will be surprised how good these little amps can sound, although it may depend on what you intend using them for, Hi-Fi or something else. Maplin 100w Rocks! I have been wanting to test the classic Maplin design for quite some time. I MOSFET AMPLIFIER BRIDGING MODULE I Converts two 15OW MOSFET power amplifier modules into a 400W bridged amplifier. note amp and added a few details from Maplin kit PCB, gate resistors and another 27pF cap. ECX10N20 Hi I found a model I just came across this: LME49720 There is an RIAA design on the first page. Combo I built the Maplim mosfet amp around 1982 and added a heatsink to the TO-92 driver. I updated the design myself last year for ALF laterals. asc 9. I was amazed to find one still unbuilt from the 1980's. Joined 2011. 2022-01-19 9:03 pm #3 2022-01-19 9:03 pm Maplin MosFET Amplifier GA28F construction thread . Thread starter jamesfeline; Start date 2014-06-08 11:03 pm; Prev. tsmith1315. I Remote Control for Amplifier. I must admit I did modify it slightly as my original Maplin one hummed a bit. I used A few months back I got hold of an unbuilt Maplin mosfet amplifier kit. It's one of those very simple circuits (like JLH's 10W class A) that The Maplin MOSFET Amplifier was originally developed for use as a guitar amp in the late seventies and first saw the light of day with the 75W Combo Amplifier project ('Electronics' by Quote Reply Topic: Maplin mosfet 150w amp - more power? Posted: 12 December 2011 at 10:19pm Ok, so this is a long discontinued module, but I have always wondered about That is the Maplin 75WRMS lateral mosfet power amplifier. I like them, IMO they "Electronics - The Maplin Magazine" and, later, "Electronics & Beyond" was a hobbyist and experimenter magazine published between 1980 and early 2002. read up member bonsai's "how to wire up an amp" presentation. Changed output transistors vertical mosfets. Joined 2008. You can even use Note that one of the posters claims the Maplin amp (shown in apps book) got unstable. 6th Aug 2023, 10:46 pm #20 knobtwiddler Heptode Join Date: Mar 2016 Location: London, UK. I built a few of these in the 80's and use Re: The Maplin MosFet Amp Post by sinus trouble » Sat Nov 25, 2017 7:30 pm This circuit has been modified soo many times yet the literature stayed original! The styling just caught my eye as strangely familiar, my first home built amp used just these very same maplin mosfet modules, which are still working after 3 yrs of student The Maplin MOSFET amplifier specified 100 Ohm resistors, enabled MHz oscillation in the output MOSFETs. Compensation using C3 is avoided you are bidding for 4 transistors shown and the a4 pages of instructions relating to a amplifier sold by maplin there is no other bits no board no amp maplin mosfet amplifier instructions build Maplin 150W MOSFET amplifier module. The current BK Electronics modules look as though they're based on it and there were innumerable commercial clones. jpg. Audio power amplifiers are essential components in any audio system, as they boost the electrical signals from audio sources to a level that can drive speakers The Kam KXR3000 is a professional grade 300 Watt Stereo Power Amplifier that's 2U rack mountable with low noise, making it ideal for of a vast range of sound reinforcement environments, from live-sound, studio to commercial 50W HiFi Power Amplifier LW35Q Maplin Kit I think I know all JLH's transistors power amp designs, and this one does not belong to them. 8nF; and C5 and C6 can be The old Maplin lateral mosfet amp could sometimes oscilllate. R. Here is my version of the Maplin mosfet amplifier. 50 watt hi fi amplifier. Maplin MOSFET Amp module rail depends o upon devices used 2 component value changes a usually required as for the "best Osc in Town" the "Gate Stoppers" being to Maplin did a lateral mosfet amp based on an old Hitachi datasheet. As for the comments about Maplin turning into Tandy, it really A good opamp based mosfet power amp is the project of 300w mosfet power amplifier by Martin Pipe which was published years ago in Maplin Magazine/projects book 71, Hi Some of you may have read my previous post, regarding the refurb of my two Maplin 100w Mosfet amp modules, where I was looking to Identify the Model of the Transformer. 2022-01-19 9:03 pm #3 2022-01-19 9:03 pm Said to have come out of Hitachi California. Hi Please find a few pics of my new Maplin 100w Mosfet amplifier construction thread . LesW Retired at user request. I've tried to keep it easy to do rather than I have just finished a lateral MOSFET amplifier project. 5 KB · Views: It reminds me of the Maplin 150W mosfet amps. A schematic and pin diagram for the 2SK1058 is shown in Figure 2. Here is my updated version. This is my most basic suggestion for improving the Maplin MOSFET amp stability. It's got Hi All! Following the interesting discussion in Sevy's sizzling amplifier thread, which has many frequency plots to determine stability, I decided to use LTspice to look at my own mods on the Maplin amp. The power supply is mounted The Maplin lateral mosfet amp circuit came from the Hitachi datasheet for the lateral mosfets. Hi Guys, Before starting a build of the famous Maplin 100W Mosfet amp, I have been experimenting with LTspice (original file by Mooly?). These two I replaced the Maplin MOSFET amplifiers with Hypex UCD amplifiers. I added better decoupling and added option for TO3 or TO247 footprints. You can make a 75WRMS or 150WRMS amplifier depending on which lateral mosfet's you use. Today I The Power Meter Story Wayback in 1982 I constructed a stereo Hi-Fi power amplifier based around a pair of legendary Maplin MOSFET amplifier modules (LW51F). That way, I can achieve a I get to reminsce about my youth with the welcome return of the Maplin 75/150W MOSFET amplifier module to my bench. I intend to double up the power Maplin 150W MOSFET amp: Back in the 90s when I was a teenager, I used to do house parties and a bit of DJing. 3/. 7 AUTO-WAA / EFFECTS UNIT Waa The Maplin Mosfet amp kit was well known. Other lateral FETs are available in the UK, like the ones from Exicon and Alfet. The build manual for the Maplin amp lists +/- 55v max in the specification but This document provides instructions for building a 100W MOSFET amplifier using the Maplin kit. By way of background, I've been intrigued by some of the very simple amplifier circuits presented here, and have wanted to explore quasi-complimentary designs for several Testing device Amplifier MOSFET 200W Sampling mode 24-bit, 48 kHz Interface E-MU1616m Testing chain E-MU1616m>Amplifier MOSFET 200W>E-MU1616m Constant. Member. rogerc. Sounds great. I have 2SA872A trannies for the LTP and Exicon 10P20/10N20 latfets for the outputs. Used in Hitachi amps of the era and also in Perreaux from the Maplin 150W MOSFET module hum modification - PCB modifications to reduce hum etc This is a fantastic kit, capable of terrific sound but it suffers from unpredictable performance and can be Hi, yes the Maplin 75W MOSFET Have built a few of these over the years Probably have one or two modules knocking about Don't know how they compare to the eBay item, but Even r penfold's book on a high powered100w mosfet amp used a 68k. The pre drilled transistor mounting bracket was very helpful. If the site has helped you and The feedback appears to be the same as the Maplin MOSFET - 33k into 1k. 111. 3 KB · Views: 152 nigelwright7557. It was never unstable or oscillated for me. Was it this one. It specifies the transistors to use, coil winding details, capacitor requirements, power supply voltages, setup procedure to adjust Maplin 25W pc Amplifier Mosfet. It was published by Maplin Electronics, a retailer of electronic goods in the UK I wanted to know what the power output of this Elliott Sound Products p101 lateral MOSFET power amplifier is at +/-35VDC. 1 electronics specialist. Attachments NOVBE. The Here is my old design for 240/9240 output amp. Looks like 2 outputs missing ? maybe blown and removed ? or just an option THE MAPLIN MAGAZINE U PROJECTS 1kW High Power Mosfet Amplifier This superb HP Mosfet amp is primarily aimed at use in halls, auditoriums or wherever the situation It presents a low impedance path to AC (audio). 216) "Lateral MOSFETs were the first to be applied to power amplifiers in See Maplin lat mosfet circuit for examples. 7R resistor mains earth must connect directly to the casing. Overview of the MO For those who would like more detail, here is an article: Mosfet Amplifier (EMM Jun 81) Sure enough, the old Hitachi circuit. 7. Added ( Mosfet Amplifier (EMM Jun 81)) Please note , each kit is complete set of components with PCB to build one mono Power Amplifier ---- Two are required for Stereo plus you will need a transformer PSU - 48-0-48 Some updates, soldering up the mods, the R3 47k resistor is swapped out for the CCS. I understand that Take control of your stage and studio audio with our range of amplifiers, Featured Best selling Alphabetically, A-Z Alphabetically, Z-A Price, low to high Price, high to low Date, old to new I designed the PCB for Maplin Mosfet amp which is in fact modified Hitachi app note circuit. murtonpikesystems. The amp Quote Reply Topic: Maplin 150w mosfet module Posted: 12 November 2009 at 11:03pm Hi everyone, i have a pair of maplin 150w amp modules that have been kicking about Wasn't this the "classic" Lateral MOSFET amp of the day if so then I'm sure we can sort this one out. Designed for use with our 25W MOSFET Amp, but can be fitted What's new Maplin 150W MOS-FET Amplifier Module This was a good example of the use of the Hitachi MOS-FETs that gave good and reliable results at low cost. 2 KB · Views: 65 B. It uses ALF16N16w and ALF16P16w lateral mosfets. You can make a 75WRMS or 150WRMS amplifier depending on Looks like the amp that Maplin sold loads of kits of ๐ E2A:- Vas transistors are different though, Maplin used Japanese components in the Vas, the rest including component 2SJ49/2SK134 are lateral mosfets according to Bob Cordell (Designing Audio Power Amplifiers, 2011, p. I will take a look at my LTspice I'm in the process of refurbing my two Maplin 100w Mosfet amps that I built back in 1982, Actually probably more like 75w as they use the 2SK133 and 2SB48 pair. uk. It uses the 1980's Maplin lateral mosfet circuit updated to use 240/9240 mosfets. I felt it necessary to The Kam KXR3000 is a professional grade 300 Watt Stereo Power Amplifier that's 2U rack mountable with low noise, making it ideal for of a vast range of sound reinforcement environments, from live-sound, studio to commercial Maplin Type Mosfet Amplifiers Number of Inputs 1 Model Mosfet Number of Outputs 1 Item description from the seller About this seller sisson132012 100% positive Feedback โข 217 items Mine have K133 and J48 and have been running at +/-63V since I built them in the 80s 120V max devices on 126V total rail - not recommended The trouble is that a blown output transistor has Based on Maplin 75WRMS lateral mosfet circuit which was taken from Hitachi lateral mosfet datasheet. 1/ Constant current source on front end. The amplifier is built around the Hitachi 2SK1058 N-Channel MOSFET. I took that circuit and improved it with CCS and better CM and front end decoupling. Explore our extensive selection of tech essentials including batteries, cables, PC & mobile accessories, cameras, Maplin 150W MOSFET amplifier module I have built a couple of these in readiness for my stereo subwoofer project, although I haven't powered them up yet. The MOSFET amp which used Lateral FET's and was based on an Hitachi application note. Joined 2020. Other stability suggestions I have seen are that R15 (that's part the snubber?) should not be non-inductive so not wirewound; bypass R7 with 6. It will Also . I dug a Just finished refurbing my original 1980's Maplin MosFet Amps, 2SK133 - 2SB48, Fitted in new case etc. Transposing the current mirror to the input pair slightly looses out is terms of asymmetry. I did not like to original Maplin pcb as published many years ago. Added source resistors. A Paul Kemble web page - Hitachi Fet designs. Polypropylene capacitors, no electrolytics, passive, better amp. Probably not as much as you are. Added Vbe multiplier. I'd say that 9/10 This, at least is what my hours of simulation of various toplogies on the Maplin MOSFET amplifier, and a push-pull tube amplifier with primary side NFB loops revealed. M manniraj Member Joined 2012 2021-09-19 7:07 pm #290 2021-09-19 7:07 pm #290 At last found sometime to finish the Maplin and it sounds excellent. Its a steal of the Maplin 150WRMS mosfet amplifier circuit which MAPLIN PROJECTS DID YOU MISS THESE ISSUES? MAPLIN PROJECTS renleb PROJECTS 577210 &MOLARS Project Book 1 Universal Timer. He sells Maplin clone PCBs on Ebay, so knows about the topology. B. Scribd is the world's largest social reading and publishing site. That was the best of the bunch. I object to the Elliot amp on one level only. If it's Hi-Fi I only (almost) only seen practical examples of on transitor VAS used in MOSFET amps. 75 watt mosfet amplifier. It uses lateral MOS in output. Maplin took it for their lateral mosfet 75WRMS power amplifier. Maplin Lateral Fet Amp CCSIII. It was designed about 1980. The smallest one came as a kit and I built it up. I built it up and it worked first time. I had weird oscillations, concluding that it would be better to stick with the usual Class AB amplifier, than Maplin LP56 GA28F 150W Mosfet Power Amplifier Kit / Neu: Sonstige / verkauft, Maplin 25 watt Mosfet Amplifier / Gebraucht / verkauft, Audio Amp Mosfet 300w x 30. I have built a couple of these in readiness for my stereo subwoofer project, although I haven't powered them up yet. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Maplin 150W MOSFET amplifier module. bucks bunny. A couple Very nice, I made a wedge of money from using those transistor in Maplin modules and building them into mobile DJ kit, I designed my own boards for a dual amp but it worked MAPLIN Old MOSFET Amplifier Here is the old MAPLIN amplifier that inspired me. I must have built well over 50 of those The UK's No. Explore our extensive selection of tech essentials including batteries, cables, PC & mobile accessories, That design is from a Hitachi lateral mosfet application note. 150WRMS disco bipolar amplifier (output transistors off pcb on heatsink) They later I am trying to build up two pcb's for bridging and what I want to do is have each board driving quite a few fets, so that each pcb is 2 ohm stable. I was deeply involved in the Unless there are details that I'm missing, the topology appears to be a variant on the Hitachi L-MOSFET apps data one, used in the HMA-7500 and Maplin amps. Adjust volume, balance, and tone whilst you sit back and relax with our infra -red remote control. Of course it may all go horribly wrong, but I have a Variac, this thing simulates OK on This amplifier was originally built in 1986 around two Hitachi MOSFET kits purchased at Maplin's Electronic stores in Manchester. Figure 2: In early 1984, Elektor magazine beat the competition hands-down by publishing the design of a then-revolutionary MOSFET amplifier. However, looks like quite a different circuit. 27pf's were a bit small and some ocillated otherwise worked well. Also tried adding a second pair of 2SJ49/2SK133's. If so then we can look at one channel at a time. 1 KB · Views: 228 mosfetBOOTnoVBE. So I used Prasi's design from post#38 in this thread. Weitere Based on Maplin 75WRMS lateral mosfet circuit which was taken from Hitachi lateral mosfet datasheet. In response to many requests, we have Skema amplifier mosfet serta kelebihan kekurangan โ Amplifier MOSFET, komponen penting dalam berbagai perangkat elektronik, menawarkan kemampuan penguatan I build and sell Maplin lateral mosfet amps and have never had any problems with hum. Front end decoupled to eliminate hum. Static 2mA low power consumption Input Here are some old Maplin amplifier modules I have either made or bought for repair. All parts are new old stock with original transistors, but all capacitors are new, just a 4804 Maplin GA28 MOSFET Kit Amplifier โ A Classic Revisited The Maplin GA28 MOSFET kit amplifier is a cherished piece of audio history, originally offered by Maplin Electronics in the I am making the Maplin 150W MOSFET modules as a quick, cheap and dirty power amp. txt) or read online for free. Before installing them in their final resting place, I ran them up on a +/ The LM386 is an audio amplifier module featuring on-board terminal blocks to connect to a speaker and potentiometer to adjust the volume. If you want to release the output devices from the chains of I much regret the discontinuation of the Maplin 150watt Mosfet Amp which was perfect for resurecting old 70`s H=H and Carlsbro amps. The This circuit improves on the Maplin mosfet amp. I have modified the boards as Traderbam Suggests in post #48, all Grounds go Alex, yes. R rsavas Member Joined 2012 2023-11-19 11:27 Combo Amplifier.
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