This negative ion generator was found in a 90s Popular Electronics. The autotransformer can be an automobile ignition coil.
This circuit with only one tuned coil was found in a 1980s American documentation. The circuit uses...
Mouser Electronics is making available the SLN-IOT-GPT Integrated Development Experience, a...
This circuit provides a high intensity pulsating signal to a speaker. The circuit is from an...