Found in a 73 magazine for radio amateurs of the 90s, this circuit provides a 2 kV voltage with 7.5 mA of current for HeNe laser.
This circuit was found in documentation from the 90s, being indicated for use with tape recorders given...
This circuit causes a relay to oscillate generating a signal that turns into high voltage in a...
Found in 80's Radio Electronics, this circuit uses an LED to indicate that a battery is being...