Field strength meter (CB8220E)

This passive tuned circuit was found in a 90s Popular Electronics. The coils must be according to the monitored waveband.

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12 V Monitor (CB859E)
If the input voltage falls below 12 V the LED glows up. Other voltages can be monitored by...
DC Motor Control (CB20442E)
This motor control using transistors was found in a recent English publication. The circuit is for...
Small Electronic Organ 4093 (CB13188E)
In the figure we have an electronic toy organ that can both serve to amuse children as a basis for...