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.

Transistor Intercom (CB1382E )
n be assembled with BC558 transistors for low power transistors and a BD136 for the output. The...
Rectangular Signals from Other Signals (CB3801E)
This circuit, found in 1980s documentation, produces a rectangular signal of the same frequency as the...
Mini Mixer (CB16348E)
This mixer with few components can be tried by the reader who needs this circuit, but who does not...