Depending on the components, given in the table, this circuit can amplify signals of 100 MHz or 400 MHz. The circuit is from a 80's documentation. Equivalent transistor can be used.
This simple motor control for alternating current with triac was obtained in a European...
This source is a variation of the previous one, using two Zen diodes to stabilize the output...
This circuit was found in an 80's General Electric documentation. The circuit uses uncommon...