This circuit uses BCD switches to program the frequency to be divided. The circuit is from a Radio Electronics magazine from February 1989.
September 2017 - STMicroelectronics STBR3012-Y high voltage rectifier for automotive use is in...
The circuit is from an old documentation making use of an operational amplifier of the time. The...
We find this TTL configuration in a 1978s documentation. The circuit generates variable pulses...