Found in a 90s Popular Electronics, this circuit aims to find the voltage of a zener diode up to approximately 20 V. The transformer may have a lower current.
This mono circuit for 10 LEDs was found in the January 1991 Radio Electronics magazine. It is...
Found in American documentation from the 90s, this circuit is ideal for wearables and can be...
This circuit produces modulated tones in a loudspeaker. The effects can be adjusted by the...