This general purpose two-transistor complementary configuration was found in the December 1972 issue of Radio Electronics magazine. The power supply is between 6 and 12 V.
It is a simple blinker that simulates the action of an alarm when installed on the dashboard of a...
The circuit is from a 1978 publication and the transistor may be the BC558. The transformer is...
This simple unregulated circuit was found in a Radio Electronics from June 1964. Note that the...