Maplin 150w mosfet module |
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GregM
Young Croc Joined: 13 December 2009 Location: NE Hampshire Status: Offline Points: 526 |
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Nice to see others' referring to the old Powertran stuff (factory was on the Portway Ind Estate in Andover), I built and used a pair of their 2u 115w amps and also built their 2u 5 channel lighting do dah - i still have that 25 yrs later!
I have a whole Powertran catalogue somewhere in my stash. |
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Tony Wilkes
Old Croc Joined: 02 August 2004 Location: West Midlands Status: Offline Points: 4840 |
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I had one of their 1U lighting controllers, in fact had a rack full of their stuff. I used to do a lot of work in Salisbury and used to drop in and collect the stuff.
Made one of their single board synths once, started at 6 in the morning and soldered in the last component at 4 am the following morning, worked fist time :) Tony Edited by Tony Wilkes - 11 January 2014 at 7:11pm |
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www.forteaudio.eu - BMS - db-Mark Processors - Lexon (SAE)
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SMP
Young Croc Joined: 16 March 2013 Location: East London Status: Offline Points: 1226 |
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I worked a few years in Disco DJ retail There used to be many such small Co's making plenty of stuff like this now they just sell on from China. Very little home-grown industry like that now. lots of the stores in Whitehorse Road Croyden Henrys RTVC all sold kits & surplus etc and unlike Maplin the sales team new their stuff
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GregM
Young Croc Joined: 13 December 2009 Location: NE Hampshire Status: Offline Points: 526 |
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Yep, thems the good old days, back when building a kit and electrocuting yourself by being a prat was your own fault, not something you could blame on the bloke who sold you the parts! Health n Saftey gone mad I say!, it provided natural selection!! Edited by GregM - 15 January 2014 at 7:59am |
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Masai
Registered User Joined: 04 January 2008 Location: London Status: Offline Points: 418 |
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Transcendent 2000? Designed by the great Tim Orr. Oh those where the days! Not a bad synth from what I remember but never got my hands one. Powertran also came out with that digital delay with the those old fashioned bank of switches. I think that was a Tim Orr design as well but don't quote me on it. That was a great time to be an electronics hobbyist. I was a bit confused with this thread as even though the header states the Maplins 'legendary' 150W MOSFET module Nigel seems to be describing their 150W bipolar kit they had before Maplin came out with the MOSFET kit. Built a few of them and they where good work horses for the sound I was in at the time. Based more or less on the Hitachi original app sheet. Over than the zobel network resi being charred they never let me down once. |
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SMP
Young Croc Joined: 16 March 2013 Location: East London Status: Offline Points: 1226 |
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I cannot help but notice ..150W MOSFET originally it was 75W but people realised increase voltage rails upgrade from the 2SK133 2SJ48 they started out with. Dave Goodman a Maplin Employee of the Early days did several projects including this one during their mail order beginnings at Rayleigh Essex
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nigelwright7557
Registered User Joined: 10 January 2008 Location: United Kingdom Status: Offline Points: 14 |
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Maplin did a few amplifier kits in those days. 50 watt hi fi amplifier. 75 watt mosfet amplifier 150WRMS disco bipolar amplifier (output transistors off pcb on heatsink) They later did an update to the 150WRMS amplifier with output transistors on heatsink on pcb. 150 watt mosfet amplifier. |
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7199 |
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And not to forget the 1k mosfet kit. A friend of mine still uses an amp I built with those on his PA. Even amazes me that it´s still going strong!
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Earplugs Are For Wimps!
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nigelwright7557
Registered User Joined: 10 January 2008 Location: United Kingdom Status: Offline Points: 14 |
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I increased the VAS capacitor and that fixed it. Modern versions of the transistors seem to have more gain. |
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