Reminder (CB9548E)

This circuit maintains on a flashing LED at a frequency determined by the capacitor. The unijunction transistor can be 2N2646.

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1800 Hz Reject Filter (CB7400E)
Found in Exar documentation from the 1980s, this circuit has a 60 dB cutoff at 1800 Hz. The...
Multimeter adapter (CB7345E)
This circuit, suggested by General Electric, increases the sensitivity of a common multimeter to 1 M /...
Single power source with 1 diode (CB22339E)
This simple unregulated half-wave font was found in old American documentation. The diode is...