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simple solar panel shunt regulator by TLC271

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A simple solar panel regulator by TLC271

Solar panel regulators come in many flavors. The plainest flavor is the simple on-off type shunt regulator. It has the advantage of simplicity, extremely small power dissipation, low cost, high reliability, but in exchange for these advantages one has to accept that the voltage on the battery is always going slightly up and down, that the battery is switched between full charging current and no charging current, and that disconnection of the battery will result in high voltage output pulses from the regulator. Depending on the application, one has to choose the most appropriate type of regulator. In most solar installations I have used my linear solar regulator design, which has the advantages of smooth voltage regulation and undervoltage load dumping, at the cost of higher cost, larger size and high power dissipation. But when I was asked to build a solar regulator for a Yacht, which has just one 3.1 Ampere panel but a 300Ah battery bank, something small and simple was more appropriate than a linear regulator. So I designed and built this one, which you might find useful for similar applications: Generally those where a rather small solar generating capacity is combined with a relatively large battery, or those where low cost, simple construction and high reliability are more important than the smoothness of linear regulation. [....] Link

Stereo Decoder with TDA1591 IC. [....] Link

As you probably know, to enable stereophonic broadcasting, audio channels LEFT and RIGHT have to be specificaly encoded in such a way that FM receivers can reconstruct stereo. This is a low cost, but powerful, stereo coder. Since the schematic is very ‘clean’ there’s no full documentation available. Just note that : * Trimmers adjust 19KHz pilot tone and output levels (see schematics). * Cap. trimmer fine tune the 19KHz pilot tone frequency (from 76KHz crystal). [....] Link

This is a simple RF receiver mainly for low-distance digital radio receiver application. The analog output of this circuit should be connected to a schmitt-trigger signal conditioning circuit with a proper value capacitor (from collector of T3). [.....] Link

With the TDA 7000 you can build an FM radio with a minimum of components; most of them so easy to manage…like the ceramic capacitors that do not require polarization…and only two resistors. The components you will employ will be of small dimensions and low cost. Even the integrated circuit itself, the TDA 7000, is not of great cost. [....] Link

The JDM (or Ludipipo) seems to be among the most popular PIC programmers used - and rightly so: it is simple, cheap and easy to build, can be run with the free and excellent IC Prog software by Bonny Gijzen, and will program pretty much any PIC microcontroller on the market. However, an issue has arisen lately with some of the new PIC’s, eg PIC12F675, 12F629, and some others with an internal oscillator. When these chips are programmed the first time, everything goes fine. However, if you later try to read or re-write to them, they read as blank and cannot be written to. The problem only occurs when the PIC has been programmed for INTOSC and MCLR_OFF, but even in this situation sometimes it will re-program OK - there seems to be some other dependence on the program which has been loaded as well. [....] Link

Calculates and displays L and C from oscillation frequency using reference components. This instrument requires two precision components: A precision capacitor and a precision inductor. You only need to start with one precision component, either the reference capacitor or the reference inductor, and using this meter, you can select or adjust the other precision component. In my case, I used a pretty high accuracy BK Precision inductance/capacitance meter and sorted through piles of inductors and capacitors to find those that had the lowest error. I then used those parts, a 1 millihenry inductor and a 0.01 microfarad capacitor, in this meter. The basis of this project is several similar projects on the world wide web and some magazine articles before the world wide web was a common means of information interchange. Unfortunately, I am not able to determine the originator(s) of the concept, but I suspect that it is as old as radio. [....] Link

This is a touch control switch which keeps the circuit on about 100 seconds after touching the plate connected to the 2 numbered pin. At the end of this time duration, relay releases and the circuit gets to off position.

The impedance of the trigger input of the 555 timer IC is very high and the inductive voltage on the human body is enough to trigger it. The circuit works based on this principle. You can use a piece of metal as a plate. [....] Link

You can use it with a bulb to vary brightness of bulb, this is a live circuit it can give a shock, enclose in plastic box, the pot should have a plastic knob, use a fuse, you can also use it for temperature control of soldering irons. [...] Link

Tubelight Electronic Choke

This is an electronic choke for a Conventional Fluorescent Lamp. This was an application note of MJE13005 a High Voltage Switching NPN Power Transistor. I Might have modified it. This was very popular in the early days, The Coil Winding and Ferrite is very Critical design.

The diodes, npn transistor and caps are high voltage 350V-1KV, The tubelight is 40W-60W 5 feet long. This circuit replaced the choke and starter in an existing frame. [...] Link