Hi!
I'm trying to make the Thomas Henry 566 VCO, the same from here, but have no luck with it. I use MFOS PSU with -15v, +15 and ground for power supply. I measure the voltage coming out of the 741 and 566 and it seems to be alright. It has non-changable strange oscillation from pin 4 and has no sound from pin 3 at all.
I have no oscilloscope, so I connect speakers to the pin 4 of the 566 to hear triangle wave. Is it correct to do like this?
If the problem is with bad 566 chip than how to figure it out?
I'm trying to make the Thomas Henry 566 VCO, the same from here, but have no luck with it. I use MFOS PSU with -15v, +15 and ground for power supply. I measure the voltage coming out of the 741 and 566 and it seems to be alright. It has non-changable strange oscillation from pin 4 and has no sound from pin 3 at all.
I have no oscilloscope, so I connect speakers to the pin 4 of the 566 to hear triangle wave. Is it correct to do like this?
If the problem is with bad 566 chip than how to figure it out?