Modulated siren 555 (CB9201E)

This is one of the many modulated siren versions that can be found on our website. We found it in a Hands On Electronics from the 90s.

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Optical Coupler Shield - II (CB1326E)
This shield can be used both to interface microcontroller circuits or TTTL. The resistor in series...
100 MHz Emitter Follower Oscillator (CB5119E)
We found this circuit in a 1980s American publication from Motorola. Modern equivalent transistors...
Audio Frequency Meter (CB20477E)
Found in a Popular Electronics from 1992, this circuit uses a PLL567 in an audio meter bridge that...