Bipolar transistors are types of general use like BC548, while the power MOSFET can be of any type depending on the current and voltage in the load. The circuit is from old documentation.
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This circuit was found in Radio Electronics magazine from October 1964. The circuit uses two...
This 5 V power supply for TTL, Shields and microcontrollers is old, and the components can be...
This automotive alarm uses common components and is suitable for old vehicles. The circuit was...