This turned out to be quite an interesting project. It all began as a project for a paying customer, but I found that the circuit had quite a lot of advantages over previous similar projects. It is basically an inverter for converting power from 12v DC to something else. You can use the circuit as shown to convert 12v DC to 230v AC (117v AC), or
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even use it to convert 12v DC to 24v DC. The output power of the AC version is about 30 Watts, which is enough to power three medium sized (11W) ecconomy lamps, or about 8 of those small 4W lamps that each give the same light as a 20-Watt lamp. You could even rectify the output to get 250vDC to power valve equipment. The DC-AC version can be adapted to generate 6vAC, in addition to 230v DC for portable operation of old valve (tube) based equipment. An EL84, for example, will deliver over 10 Watts of RF in the HF band, and the efficiency is still comparable with transistor devices. The heated cathode takes just 2 Watts. The 12vDC 24vDC or -12vDC configuration will deliver about 3 Amperes at 24v 65 Watts, or -12v 32 Watts. To do this you convert 12vDC to 12vAC, full-wave rectify this and put the new isolated 12vDC in series with the input 12vDC. Your output will then be 24vDC at 3 Amperes, for 6 Amperes input. Reverse the diodes and reference the rectifier to ground and you will get -12v at about 3 Amperes for 3 Amperes input. See below: But as a DC-AC converter, the output frequency accuracy is good enought to run a clock-radio for a short duration of time, without gaining or loosing more than a few seconds per day. The important bit is that you choose stable capacitors and take care to get the frequency right. You should be able to get it better than 0. 1% with just a little effort. The heart of the waveform generator is...
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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