This DC Motor Temperature Controller Circuit Diagram is based on two transistors, used to control the speed of 12 DC volts fan depend on temperatures. A thermistor (R1) is used to sense the temperature. When the temperature increases, the base current of Q1 (BC547) will increase which in turn decreases the collector voltage of the [...]
This is a project to create the instrument capable to measure all but the largest capacitors used in radio circuits. Most variable capacitors aren’t marked with their values, unlike variable resistors. The markers of capacitors from salvaged equipment often rub off unintentionally. This project will prove quite useful to the constructor, antenna experimenter, or vintage [...]
This simple 4W fluorescent lamp driver circuit diagram can be operated from a 12 V power supply. The first portion of the circuit includes a NE555 timer IC wired as an a stable multivibrator. The transistor Q1 amplifies the output pulses to the IC. The transformer steps up the the collector voltage to around 1KV [...]
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