Hello all,
Recently I built a cool amp based off of a kit I purchased off of eBay from a place in Florida called Valkits. Great little amp, if you give it a push....it uses a jfet as a buffer amp with signal being taken off the source side, so zero gain, but lower impedance, into a baxandall stack into a tl071, into a tda2030a. I added a jfet preamp using a j201, with a drain voltage of about 6 volts after a 22k resistor with 12 VDC fed from a Milwaukee M12 cordless tool battery! I also added a dc to dc 12 volt to 9 volt Amazon "converter" which is just a regulator, for a source of pedal power. It works and sounds fantastic, but with my pedals ran from the same supply as the amp, I get a constant white noise hiss. You can't hear it with signal present but it's really annoying! When I switch pedal power to an independent source, the hiss isn't there! Any good noise filter suggestions?
Recently I built a cool amp based off of a kit I purchased off of eBay from a place in Florida called Valkits. Great little amp, if you give it a push....it uses a jfet as a buffer amp with signal being taken off the source side, so zero gain, but lower impedance, into a baxandall stack into a tl071, into a tda2030a. I added a jfet preamp using a j201, with a drain voltage of about 6 volts after a 22k resistor with 12 VDC fed from a Milwaukee M12 cordless tool battery! I also added a dc to dc 12 volt to 9 volt Amazon "converter" which is just a regulator, for a source of pedal power. It works and sounds fantastic, but with my pedals ran from the same supply as the amp, I get a constant white noise hiss. You can't hear it with signal present but it's really annoying! When I switch pedal power to an independent source, the hiss isn't there! Any good noise filter suggestions?