Hi,
I just want to share with you this little amplifier.
I use it, with a smaller output cap (470u), as a guitar amp (it needs a buffer in this case).
Cheers.
I just want to share with you this little amplifier.
An externally hosted image should be here but it was not working when we last tested it.
I use it, with a smaller output cap (470u), as a guitar amp (it needs a buffer in this case).
Cheers.
Using a bulb amp leads to compressor as the bulb resistance changes with current. Using a current source in stead of the bulb it improves it by orders of magnitude. A simple regulator chip and single resistor configured as current source. It does not add much to the complexity and t is probably even cheaper than a bulb.
That is a nice thing to have if you want to use this amp as a guitar amplifier 😉
Two lamps costs 1.5 Eur (auto/car lamps).
I'm questioning the gate bias resistor. Might it not be a better idea to replace the 10 meg resistor with a voltage divider pot which is connected between +9 and Common Ground? This would permit you to accurately adjust the optimum operating point of the MOSFET and reduce the very high input impedance.
I've done a version just like you said, a few days ago and it works great...
An externally hosted image should be here but it was not working when we last tested it.
For a guitar amp it is a good thing to have an high input impedance.
Thanks.
I was afraid that the very high input impedance might lead to unstable operation.
It could also increase the possibility of RF and other interference on the input of the amplifier.
Good job!
It could also increase the possibility of RF and other interference on the input of the amplifier.
Good job!
- Status
- Not open for further replies.