This inverter with the 555 IC provides a high voltage output, but very low current. We found it in an 80's documentation. The transformer is according to the desired voltage.
The circuit shown is from the 1977 GE semiconductor manual. More modern equivalent SCRs can be...
The frequency of this oscillator depends on the amount of light incident on the LDR. The circuit,...
Here we have an interesting circuit found in a 1981 publication that causes two LEDs to flash...