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.
Found in a 90s EDN, this circuit makes use of period components. The maximum current depends on the...
This circuit uses two light-activated SCRs or LASCRs, uncommon components today. The power depends on...
This circuit was obtained in a magazine for radio amateurs 73 of the 90s. The circuit is based on...