We found this circuit in the March 1980 Radio Electronics magazine. The circuit used is the HA2400 released at the time. The power supply must be symmetrical.
This circuit is from Texas Instruments' own datasheet for this low voltage operational amplifier. The...
The purpose of this PLL circuit that we found in the November 1986 Radio Electronics magazine is...
This well-known two-transistor oscillator circuit was found in the April 1964 Radio Electronics magazine....