This circuit, obtained from a 1965 magazine, can still be assembled using some modern equivalent components. The transistors may be BC558 and the transformer is obtained from a disused transistor radio.
This TTL circuit for PC was found in an English documentation from 1992. The integrated circuit used...
In this circuit we have the voltage multiplied by 5, obtaining between 50 and 80 V output when the...
The range for this transmitter is up to 100 m. The signal can be received by any circuit tuned for the...