Transistorized Bragraph (CB7009E)

This circuit was found in 80's Popular Electronics. The components used are common and the number of indication channels (LEDs) can be changed.

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Triggered Flip Flop (CB15634E)
A configuration that can be used to do frequency division, and that uses only a current amplifier, is...
40 to 60 MHz divider by 2, 3 and 4 (CB13730E)
This circuit is from an old American publication. It divides a 40 to 60 MHz TTL signal by integer...
6 V Lamp Astable (CB13718E)
This circuit was originally recommended for an electric oven warning system. However, we can use...