Any Maplin MosFet Amp Guru's on here?

[DiyGazza]

I wonder how many people here have Maplin amps that they would like to upgrade...perhaps keeping the original FETs and transferring them to a new board with a better circuit?

I for one would, but I would rather keep the old modules for a (as was) example, and build any upgraded design from scratch, possibly using the Exicon T03 Fets.

 

[amptech]

I still have some of those buzxxxx fet's t03's

 

[sottomano]

Hello

sorry you have lost me ? what do you mean 😕

I was stating the obvious. Brian (Traderbam) asked how many would be interested to "upgrade" this small amp, perhaps keeping the output devices.


No one seemed really interested, and some had shown their already upgraded (if not completely different) amps, with other or more OP devices, and such.

 

[sottomano]

ATM I'm anyway a bit short of time, struggling with a discrete phono pre who starts oscillating at about 2 kHz when I'm trying to fit the PCB into the case... weird.

 

[jacques antoine]

This circuit improves on the Maplin mosfet amp.
1/ Constant current source on front end.
2/ Proper 2 transistor current mirror.
3/. Front end decoupled to eliminate hum.
I have built this and tested it and it was very good.

An externally hosted image should be here but it was not working when we last tested it.

Hi Nigel,

I know it's a fairly old thread with invisible pictures.
Would you happen to still have the schematics of your modified Maplin amp?
Thanks.
Cheers,

Jacques