We found this circuit in an 80's manual. The same configuration can be adapted to make use of modern operational amplifiers. The power supply is symmetrical.
We found this oscillator in a 1978 amateur radio documentation. The circuit supports other...
This circuit activates 5 LEDs according to the level of the analog input signal and can be used...
Found in the April 1978 issue of Radio Electronics magazine, this circuit is intended to be...