16-11-2013, 08:49 PM
I've been doing a bit of re-jigging of this today.
For all that it was OK with the LM386 in I knew that it was fundamentally the wrong devise to use and had fitted it because it was about the only thing I knew how to use at the time. As well as my knowledge growing since then so has my experience and I was getting ever more suspicious that it could be better.
The obvious thing would be to bung another valve in but I've no idea how much redundancy there is in the power supply and the last thing I want to do is over-load the transformer.
As it was now residing in my junk box I fitted the µA741 board I recently removed from my stand-alone amplifier. After a bit of fiddling this sounds far better. I wouldn't say it's much louder but has more depth somehow. There's also less background hum which was very surprising as it's PSU is unregulated.
Here's the circuit:-
The experts will no doubt be loading their shovels with burning coals to heap upon my head but it sounds very nice to my ears.
- Joe
For all that it was OK with the LM386 in I knew that it was fundamentally the wrong devise to use and had fitted it because it was about the only thing I knew how to use at the time. As well as my knowledge growing since then so has my experience and I was getting ever more suspicious that it could be better.
The obvious thing would be to bung another valve in but I've no idea how much redundancy there is in the power supply and the last thing I want to do is over-load the transformer.
As it was now residing in my junk box I fitted the µA741 board I recently removed from my stand-alone amplifier. After a bit of fiddling this sounds far better. I wouldn't say it's much louder but has more depth somehow. There's also less background hum which was very surprising as it's PSU is unregulated.
Here's the circuit:-
The experts will no doubt be loading their shovels with burning coals to heap upon my head but it sounds very nice to my ears.
- Joe
