Double Christmas Flasher (CB25106E)

This circuit was published in the December 1987 Radio Electronics magazine. It uses two 555s to drive 6 flashing LEDs.

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Ocean Sound Generator (CB25489E)
This circuit called “surf man” was published in the August 1992 Radio Electronics magazine. It...
Oscillator triggered by light (CB20355E)
This Hartley oscillator uses an audio output transformer that can be obtained from small, unused...
Bipolar Transistor Colpitts Oscillator (CB4582E)
The oscillator shown in the figure can generate signals between 3 and 15 MHz approximately, depending...