This circuit was found in a 1969 Mullard documentation. Used transistors can be replaced with modern equivalents. Output transistors may be BD135 and 136 with heatsinks.
Figure bellow shows how the flip-flops of a 4027 can be connected to perform a divide-by-5 counter [odd...
The MC1436 can also be used on this circuit suggested by the 1993 Motorola Linear Interface ICs. The...
This is one of many twin-T oscillator configurations that can be found in this section and on this...