Lamp Timer (CB21291E)

This circuit was found in a Popular Electronics from the 90s. The circuit uses TTL technology and must be powered by a voltage of 5V.

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Light change detector (CB22058E)
This circuit only detects variations in light falling on the sensor. The circuit uses an LM380 as a...
Locking circuit with the LM3909 (CB14294E)
This latched switch configuration was obtained from National Semiconductor documentation on the...
Wheel of Fortune (CB20962E)
This electronic roulette circuit with 10 numbers was found in a Popular Electronics from the 80s....