Found in Motorola documentation from the 90s, this circuit makes use of a triac from that time. The circuit is for the 110 V mains but can be modified for other grid voltages.
This circuit was found in a Popular Electronics of 1993. The operational amplifiers can be the...
Here we show how two 4017s can be cascaded to count above 10. The circuits are driven by a square...
This circuit produces two signals with inverted phases. One is taken for the emitter of Q1 and the...