its not tested, but the small device pinouts are same as original sch posted here.
25W Class A amp with Lateral MOSFETs
25W Class A amp with Lateral MOSFETs
Maplin 100w Rocks!
I have been wanting to test the classic Maplin design for quite some time.
I did not like to original Maplin pcb as published many years ago.
So I used Prasi's design from post#38 in this thread.
I used the highest hFE matching 2SA872A in my collection for the LTP and KSA992/KSC1885 for the VAS and stuff.
Outputs are old stock 2SJ162 and 2SK1058. Offset ~5mV.
It sounds surprisingly good with deep bass, no hum no hiss.
Thanks Prasi for the perfect pcb design (as usual!).
I have been wanting to test the classic Maplin design for quite some time.
I did not like to original Maplin pcb as published many years ago.
So I used Prasi's design from post#38 in this thread.
I used the highest hFE matching 2SA872A in my collection for the LTP and KSA992/KSC1885 for the VAS and stuff.
Outputs are old stock 2SJ162 and 2SK1058. Offset ~5mV.
It sounds surprisingly good with deep bass, no hum no hiss.
Thanks Prasi for the perfect pcb design (as usual!).
Attachments
I am glad that you like the amp and pcb.
I have also done an upgrade to the Maplin lateral mosfet amplifier.
I added front end RC decoupling to stop output signal or supply hum getting into front end. I also added a DC offset pot.
I also added option for TO3 or TO247 lateral mosfets.
It sounds great and deadly silent with no signal in. Perfick !
PCB courtesy of PCBCAD720 and JLCPCB.
I added front end RC decoupling to stop output signal or supply hum getting into front end. I also added a DC offset pot.
I also added option for TO3 or TO247 lateral mosfets.
It sounds great and deadly silent with no signal in. Perfick !
PCB courtesy of PCBCAD720 and JLCPCB.
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