This circuit allows you to read resistors up to 20 M ohms, converting it into voltage. The circuit is from the 90s. The operational ones used admit modern equivalents.
Depending on the transformer used, the power of this inverter can reach 300 W. This is a critical...
This circuit from an old American publication uses a 12 V transformer and an incandescent lamp in an...
This circuit with an unusual configuration was found in the January 1974 issue of Radio...