We found this circuit in a Hands-On Electronics from the 90s. The circuit must be connected to an external amplifier. Frequency control is capacitive, using an antenna for this purpose
Small power transformers can be used on this circuit. The high voltage generated has a maximum...
In the given circuits, LEDs are used as zeners for the ignition voltage which depends on the...
Originally created to feed the filaments of a 12AX7 as an audio preamplifier to eliminate the...