741 Filter (CB24265E)

The 1 kHz tuned filter shown uses a 741 op-amp. The components can be re-scaled to suit the desired frequency.

Xenon strobe light (CB9108E)
This circuit was obtained from an American documentation from the 1980s. The T1 triggering...
Astable with voltage limitation (CB21826E)
Found in a 1974 Ferranti manual, this circuit uses diodes to limit the voltage on the transistors. The...
Voltmeter with the CA3140 (CB12306E)
This circuit is from an English publication of 1991. With it you can use a common multimeter on...