This circuit is from an old documentation, but perfectly current. In place of the battery, 2 or 4 small cells can be used.
This circuit for receiving or transmitting low power was found in old American documentation. It is...
Suggested by the 90s ARRL Handbook edition, this circuit aims to reduce or cancel noise at the...
This circuit allows you to read capacitances on a common analog instrument. It is part of an...