Recent content by modulardesign

Corrected Schematic and PCBs are accessible here https://www.pcbway.com/project/shareproject/SYMPHONY_audio_power_amplifier_f05686aa.html

While single integrated Darlington's may not need base stoppers, paralleled integrated Darlington's are no less than mosfets, use base resistors if used in parallel, testing took place under current limited lab supplies so no output devices were lost

50% off sale while stocks last https://www.pcbway.com/project/gifts_detail/Speaker_Delay_and_DC_Protection_Module_9e904273.html

Whens a SANSUI not a SANSUI. The PCB ended up quite beautiful https://www.pcbway.com/project/shareproject/SANSUI_legacy_audio_power_amplifier_a_rebirth_4a7881e9.html

SANSUI legacy - a rebirth Looking forward to revive your problematic 4 stage Sansui amplifier series.Look no further than this thread. Four stage amplifiers were based on the premise that rather than have the input stage doing 32db by itself it would be better to have it do 20db and then a...

Spoilt for choice?, welcome the newest member https://www.pcbway.com/project/shareproject/SYMEF_Ensemble_audio_power_amplifier_bf5439e4.html

Schematic link for V2024 updated. The SYMEF amplifier off the bat was a great amplifier, so even improving it becomes hard. https://www.pcbway.com/project/shareproject/SYMEF_Audio_Power_Amplifier_8bb70aa8.html

Finished upgrade with piano sample and heavy gauge wiring

Power supply capacitors 30000uf ripple vs 10000uf ripple

The 2SD2560 with hfe 30000 ft 70Mhz, cob 120pf needs a little slow starting. Look out for the next video where Dr Stephen slow starts the output stage with some base resistors on the drivers

Happy new year, here's the schematic

Watch out for 30% off starting today to the 12th December 2023 https://www.pcbway.com/project/gifts_detail/Speaker_Delay_and_DC_Protection_Module_9e904273.html

Watch out for 30% off starting today to the 12th December 2023 https://www.pcbway.com/project/gifts_detail/1DIFFSYM2QC_TYPE_S220_Watts_Class_AB_amplifier_8af300dc.html

more pics of protection

Here's Dr. Stephens latest build of the DC servo variant 1DIFFQC SYMPHONY