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The Objective2 (O2) Headphone Amp DIY Project
The Objective2 (O2) Headphone Amp DIY Project
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Old 23rd September 2018, 02:52 PM   #5301
kiler is offline kiler
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Also sorry for the double post but can't edit. The striped side of D3 reads 27.7 and the non striped part of D4 reads -27.7
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Old 23rd September 2018, 06:11 PM   #5302
Mooly is offline Mooly  United Kingdom
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The Objective2 (O2) Headphone Amp DIY Project
Those voltages are good. The regulators (the 7812 and 7912) need at least 15 volts to work, and less than 36 volts which is their maximum rating. So all good so far.

Next step is to check the regulator outputs which is easily done by measuring the voltage on D1 and D5.

D1 should have +12 volts on the non striped end and about +11.3 on the other end.

D5 should have -12 volts on the striped end and about -11.3 on the other end.

Those lower voltages (the - and + 11.3) should then be present on pin 8 of U2 (+11.3) and pin 4 of U2 (-11.3)
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