The basis of this circuit is the HA2400 released at the time. The circuit is from a Radio Electronics magazine from March 1980. The power supply must be symmetrical at 15 V.
This oscillator was found in the September 1984 issue of Radio Electronics magazine. The frequency is...
This simple 555 biofeedback circuit was found in the December 1983 issue of Radio Electronics...
Found in documentation from the 1980s, this circuit generates signals that can reach a few...