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.
This circuit has the muting action delayed by the action of C5. The circuit is from the SGS linear...
This circuit was found in the November 1959 Radio Electronics magazine; The circuit generates a...
The integrated circuit used in this detector is uncommon today. We found it in a documentation from the...