Archive for September, 2008
Motor speed control
This motor speed control circuit uses only seven components to regulate the speed of a motor. Simple and very cheap to contruct. This circuit controls the speed of a motor from 0 to 50 % of its nominal power. Resistor R1 and potentiometer P1 divide the positive halfwave swing of the line voltage. During [...]
Drill speed regulator
A mini-drill machine is always needed in drilling the printed circuit board. It is usually powered by batteries that limit the drill’s capacity.
Using a power supply adaptor with a speed regulator like the one featured here can certainly improve the performance of the drill.
The speed regulator can maintain the speed of the drill no matter [...]
Presence detector
This presence detector circuit reacts to a conductive object within a certain defined area. For example if somebody walks near the sensor plate of the detector circuit, the relay closes thereby switching on whatever signalling device is connected to it. This presence detector circuit design does not register the actual movement of the conductive object. [...]
