LED beacon (CB21017E)

This circuit was taken from a popular 90's Electronics. The LDR is mounted next to the LED to feed back the circuit.

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Sound effects generator (CB8448E)
Found in an 1989 R-E Experimenters Handbook, this circuit produces several sound effects that can...
Who is the Fastest? (CB203E)
Only one LED is turned on when S1 and S2 are pressed. The LED that will be on is just the...
Low Noise Crystal Oscillator (CB6151E)
This circuit was found in an 80's Electronic Design. The frequency depends on the crystal and the...