This is another design generated at the request of my father. It is designed to be a dimmer for a 12V reading lamp, but could also be used as a motor speed controller (for a drill). The circuit pulse the voltage seen by the load an the pulse width is variable across the entire range from 0 to 100% (i. e. from off to fully on). The circuit is extrem
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ely simple, using 2 inverter gates as an oscillator, and the remainder in parallel to drive the FET. The circuit schematic is: Because the circuit is simple, and I only wanted one of them, I didn`t think it was worth making an etched PCB, so a veroboard layout was produced. The layout below is intended to be mounted to a panel using the potentiometer thread and has screw terminals for the power wires. The FET will also be mounted on the panel so that some heatsink effect can be gained from the panel. To allow this, and easy access to the screw terminals, both the Potentiometer and FET are mounted on the track side of the board. The Potentiometer is mounted in contact with the board and also glue is applied to keep it in place. The leads of the FET are bent up as shown and it is soldered in place so it is flat on the back of the panel. As the leads of the 1N4148 diodes are so small, they share a single hole for the common connection. If you want to reverse the direction of operation of the potentiometer, just reverse both diodes from that shown. I later decided that an etched PCB was worth the trouble and created the following layout, which is intended to use a connector block with a 4mm pitch. The PCB shown is at 600 dpi and shown looking from the track side.
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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