This simple timer with unijunction transistor was found in an old American technical documentation. We can use 2N2646 for the unijunction and BC548 for the transistor.
This powerful source is indicated for FM transmitters above 2 W. It provides 18.2 V of output with...
This simple circuit is designed to charger AA or AAA Nicad batteries. Current can be changed...
This amplifier uses hybrid modules Sanken and can provide powers of 10 W or 20, depending on the...