We found this circuit in a Poptronics from 1998. The circuit can be extended to more competitors with another 4011. The power can be made with voltages from 6 to 12 V.
We found this circuit in an American 1980s documentation. The operational ones used are not common...
This low frequency square wave oscillator using the 741 Operational Amplifier produces sound when...
May 2017 - New sequencers UDC9090A for monitoring up to 10 power supplies from Texas Instruments...