So i play guitar and i've been into electronics for a while, and this site helped me a lot. I have learnd about op amps and done many simulations with them. Howerver I've never accually put this stuff in reality. So i bought a breadboard last week.
I had some tl071 from before, so i put one on breadboard and created a simple non-inverting buffer. Connected to 9+ power supply and no biasing. It worked but the volume pot had a terrible stratchy noise and when i turned it all up, there was no signal at the output of the opamp. However, an input cap an a shut resistor after the cap solved the problem. I still don't understand why the signal on the output disappeared when i turned volume all the way when there were no cap and resistor.
However as i proceeded to improve my buffer, i tried to bias it, but first i put a cap on the output, to block dc i was going to have with biasing. However there is no sound from my amp. As i remove capacitor there is sound again. Then I put a 1k resistor in series instead of cap -- no sound, except when i set input pretty high, apmflifier does horrible noises. I put a 220k shunt resistor after that -- still no sound. I could not understand why there is no signal with a small resistance in series, so i put a trimmer in place of the resistor. When i increase resistance from zero a little more, there is a pop and there is no sound again. I cannot understand why does the resistance in series block the signal?
Thank you,
Mile
I had some tl071 from before, so i put one on breadboard and created a simple non-inverting buffer. Connected to 9+ power supply and no biasing. It worked but the volume pot had a terrible stratchy noise and when i turned it all up, there was no signal at the output of the opamp. However, an input cap an a shut resistor after the cap solved the problem. I still don't understand why the signal on the output disappeared when i turned volume all the way when there were no cap and resistor.
However as i proceeded to improve my buffer, i tried to bias it, but first i put a cap on the output, to block dc i was going to have with biasing. However there is no sound from my amp. As i remove capacitor there is sound again. Then I put a 1k resistor in series instead of cap -- no sound, except when i set input pretty high, apmflifier does horrible noises. I put a 220k shunt resistor after that -- still no sound. I could not understand why there is no signal with a small resistance in series, so i put a trimmer in place of the resistor. When i increase resistance from zero a little more, there is a pop and there is no sound again. I cannot understand why does the resistance in series block the signal?
Thank you,
Mile