1DIFFSYM2QC type S class AB audio Amplifier

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1DIFFSYM2QC Audio Amplifier
$120 mono, $240 stereo
free shipping and protection module for email order
Datasheet

 

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This is a 1DIFFQC descendant, for this particular module you can use upto +/- 60VDC however plus minus 50 is just fine
For alternative ship direct https://www.pcbway.com/project/gift...E_S220_Watts_Class_AB_amplifier_8af300dc.html

 

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The free shipping and protection module offer has now expired.

 

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PM me to get these at 30% off for this month. No limits

 

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For this month fully assembled modules 2 channels including shipping $200

 

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PM me to get these at 30% off for this month. No limits

This has offer has expired and now you can get the modules direct from the store

1DIFFSYM2QC TYPE S220 Watts Class AB amplifier - Redeem Hardware Products, DIY Electronics, and Kits by PCBWay Beans

Product Overview：Class A/B amplifiers are known for providing warm and full bass. The 1DIFFSYM2QC amplifier is particularly impressive, offering a huge soundstage, accurate vocals, and detailed highs....

www.pcbway.com

 

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Slew rate 40V/us

 

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Damping factor 1600 into 8 ohm, perfect 100k square waves

 

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Same SYMEF type S midrange with multiple layers and textured 3D palpable sound stage. Difference between this and SYMEF type S is that this has multi layered textured highs while SYMEF type S has multilayered textured bass, very few amplifiers can match let alone unseat SYMEF type S bass rendering. However many people are bass texture deaf in which case this is the better amplifier depending on your hearing. Both this amplifier and SYMEF type S are stable even with loss of compensation. Now accepting Christmas pre orders. Best wishes

Max specs for both Amps with suitable protection modules
1DIFFSYM2QC TYPE S
800VA 45V TRANSFORMER stereo
Per channel
173 Watts 8Ohm 0.01% THD (13600u per rail)
291 Watts 4Ohm 0.01% THD (13600u per rail)
477 Watts 2Ohm 0.08% THD (13600u per rail)(Risk of transformer failure use fuse on primary)

 

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

 

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more pics of protection

 

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Watch out for 30% off starting today to the 12th December 2023

1DIFFSYM2QC TYPE S220 Watts Class AB amplifier - Redeem Hardware Products, DIY Electronics, and Kits by PCBWay Beans

Product Overview：Class A/B amplifiers are known for providing warm and full bass. The 1DIFFSYM2QC amplifier is particularly impressive, offering a huge soundstage, accurate vocals, and detailed highs....

www.pcbway.com

 

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Happy new year, here's the schematic

 

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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

 

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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

 

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Corrected Schematic and PCBs are accessible here

SYMPHONY audio power amplifier - Share Project - PCBWay

Measures142.37mm * 129.92mmWhile 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...

www.pcbway.com