This interesting circuit converts BCD signals into a voltage that can be used in an analog application. The circuit was found in the July 1991 issue of Radio Electronics magazine.
Linear Technology's LT213 circuit, which suggests this application in 90s documentation, is not...
This circuit is more elaborate than the previous one, employing an integrated amplifier circuit of the...
This circuit was found in a PE Hobbyst Handbook from 1992. The second oscillator is a VFO. The...