The first thing you must have in your workshop/lab is power supply. In experimenting many new electronic circuit design, it is easier if you have a flexible adjustable power supply. Here is an adjustable 0-30 volts power supply design. The circuit schematic diagram is shown below. The core of the circuit is 723 voltage regulator integrated circuit
Click here to download the full size of the above Circuit.
. A Darlington pair Q2 Q3 boost the current to give 1A output. The minimum voltage adjustment for this regulator IC is 2 volts above V-. Zero volt is achieved by supplying the V- with a voltage under -2V, so the output can be adjusted to zero. The negative supply is provided by the components around D3 and D4, stabilized by 5. 1 Zener diode. The variable resistor R3 is used to set the current limiter, so your power supply will be save even when you short its output to ground. To set the zero point, turn the R11 potentiometer to minimum (counter clockwise) and adjust the R12 trimmer potentiometer until the output is zero. After this setting, turning the R11 potentiometer to the maximum will give around 30V output. If at the maximum position the output is smaller than 30V, it`s likely caused by the components tolerance, you can lower the R10 value. Make sure you use larger track for ground connection on the PCB, and provide sufficient heat sink for Q3.
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.....
characters left: