This circuit is from an old RCA documentation. The circuit sources a charging current of 1 A and is intended for the 6 V lead acid battery used in some cars of the era.
This circuit was obtained from an old American documentation, and practically any general-purpose transistor...
This circuit is intended for monitoring an environment. It fires a relay with a sound, but only if...
This circuit is from an old documentation, but perfectly current. In place of the battery, 2 or 4...