This circuit consists of an inverter powered by only 4.5 V. The circuit is from a 1967 Mullard documentation. No information was provided on the transformer winding. Capacitors can be 1.5 nF x 3 kV.
This circuit is from a 60's documentation. The circuit uses components from the era and serves to...
This oscillator for the practice of telegraphy provides a good sound in a loudspeaker, with only...
Found in a Philips documentation from 1968, this circuit detects the trimpot set input voltage....