Garbz
Headphoneus Supremus
- Joined
- May 19, 2004
- Posts
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So i built the multi hybrid headphone amp. It's powered by 24v and is single ended so naturally there's quite the few volts of offset on the output. Hence the design has an electrolytic output cap, should match the ****** source perfectly.
Currently on the output there's a 220uf 16v cap, followed by a 4.7k bleeder resistor, and a 120ohm output series resistor. The load is 300ohms (Sennheisers). The problem is when I simulate this load with dummy resistors and do DC offset measurments I get a power-on thump of 2-3v for about half a second, and power-off thumps of 800mV for a smaller fraction of a second. Since I intend to use the amp in an area where power failures are frequent I need to get these solved. It's not a punishment I want to expose my headphones to too frequently.
So is there something I don't understand about using such output caps or is this common behaviour for single ended amp designs?
Currently on the output there's a 220uf 16v cap, followed by a 4.7k bleeder resistor, and a 120ohm output series resistor. The load is 300ohms (Sennheisers). The problem is when I simulate this load with dummy resistors and do DC offset measurments I get a power-on thump of 2-3v for about half a second, and power-off thumps of 800mV for a smaller fraction of a second. Since I intend to use the amp in an area where power failures are frequent I need to get these solved. It's not a punishment I want to expose my headphones to too frequently.
So is there something I don't understand about using such output caps or is this common behaviour for single ended amp designs?