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Help with Mosfet module please
Help with Mosfet module please
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Old 7th September 2008, 07:40 PM   #1
Beejay is offline Beejay  South Africa
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Join Date: Sep 2008
Unhappy Help with Mosfet module please

Hi there Guys.
Please give some guidance. I have got two mosfet modules , 50Watt I think, which I have had since the early 1990's. They have given me exelent service with continious trouble free opperation. I have dismantled the case they were in ssome years ago and for the hell of it can not remember the precise wiring on the power supply. It has a AC pin on the PC board which I think went to the TX side of the rectifier, somewhere.

Please help, I would hate to lose these modules of take the expensive smoke out of the Tranies, I know they are obsolete. (K135; J50)
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Old 7th September 2008, 08:42 PM   #2
stoN_Cold is offline stoN_Cold  Serbia
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Location: Belgrade RS
Default Hi!

AC & Gnd are for DC protection, on the right side of PCB.

AC is about 20V for 24V relais.

AC pin is directly connect to Anoda .

Regards zeoN_Rider
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Old 9th September 2008, 04:11 PM   #3
Beejay is offline Beejay  South Africa
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Ok?, But where does it connec to on the power supply. If my memorie serves me well, it was on the Positive terminal of the bridge rectifier AC side. Can anyone confirm this ?
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Old 9th September 2008, 05:04 PM   #4
Mooly is offline Mooly  United Kingdom
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Help with Mosfet module please
Probably like this.
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Old 9th September 2008, 05:14 PM   #5
homemodder is offline homemodder  Portugal
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Join Date: May 2006
Hi Beejay

Im a ex SA, when I saw this pic of yours it put a smile on my face, I also built this amp when i was still a teenager going off to Wits varsity. I built two monoblocks which are still operational and getting dust as I didnt bring them with me. They are called KW Mos120, rated for 120W, if you built them with the transformer included in the kit, I have the circuit diagram with me but not the construction tutorial which came with the kit. If youd like to find more precise info I suggest you to phone the company that sold those kits, they are called RS electronics and are situated in Springfield JHB south, they are not part of the worldwide british company with the same name, which there is in Woodmead.

This is one very very good sounding amp, which I hope you get going again.
If you manage to locate RS do yourself a favour and buy another pair of mosfets and stick them in those empty spaces. RS will most probably have stock. I modified my monoblocks for even higher performance with higher quality input and vas transistors and I can honestly tell you they sounded better than amps costing R10 000,00 and that was back in 1991 .They will do very well compared todays modern high end amps

Where is steelpoort, east rand??
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Old 10th September 2008, 11:06 AM   #6
AndrewT is offline AndrewT  Scotland
Join Date: Jul 2004
Location: Scottish Borders
If you want to stuff the empty FET locations then the pairs of FETs must be matched.
regards Andrew T.
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Old 11th September 2008, 04:21 PM   #7
Beejay is offline Beejay  South Africa
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Join Date: Sep 2008
Hi Mooly, I agree with the connection to AC on your digram, that was also how I remembered it.

Homemodder, What a pleasure Boet !!!!

Allways nice to chat to someone from the same naberhood.

Ja, I know RS Components very well, I actualy still deal with then. When I bought these back in the day, it was from a dealer in Welkom, Free State. I never Knew who the actual suppliers were. Have you seen the new ones RS UK have on offer now. I got a prise on one of the 100W mono blocks and it is very reasonable. Only about R700 or 50 Pounds. Ofcourse without case or P/Supply.

I build my own Power supply then with a 1KVA (1000Watt) Transformer and 4x 10 000uF caps. They realy pusshed well and the sound, as you say was exelent!

Due to space restrictions I need to reduce the cap bank to 2x 15 000 uF and only about 400 VA. I believe that this is still more than ample for the 60 Watt RMS block. You should remember the 80's when every body was DJ-ing somewere and bigger was better !

Steelpoort is a One-Horse-Town in the Lydenburg district. More or less halfe way between Pietersburg (Polokwane) and Nelspruit. Sinc the Gold fields and the industries around them dissapeared, This is where major developements are happening in the platinum and Ferro Chrome industries.

a Gold rush all over again.

I will definitely chat to you again.

Thanks to all for the tips and hints, hope I will be able to return the favour !!!
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