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TGM8 - an amplifier based on Rod Elliot P3a
TGM8 - an amplifier based on Rod Elliot P3a
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Old 22nd April 2018, 08:28 PM   #901
Bigun is offline Bigun  Canada
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TGM8 - an amplifier based on Rod Elliot P3a
If a dc-fault condition arrises at the amplifier output the dc voltage at R32/C16 will reflect this and it will be either + or - depending on the fault.

A + fault will turn on Q12. This will pull-down the voltage at the base of Q15 and turn it off, draining the charge on C20 via R35 and depriving the opto of current thus disconnecting the speaker.

A - fault will turn on Q13. This drains C20 and pulls the base of Q15 down to turn everything off.

It's not the fanciest circuit, it has some weaknesses and no doubt could be improved by adding more parts but I like it's elegance.
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Old 23rd April 2018, 12:27 AM   #902
pinnocchio is offline pinnocchio  Canada
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Thanks for all the information!!

I will get to this shortly and test

Thanks
Do
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