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Battery voltage Monitor using an LM358 op-amp - This circuit is used to monitor the battery voltage, using a bi-color LED to indicate the state of the battery. When the LED is "GREEN" the battery voltage is above 11.9 volts. When the LED is "YELLOW", the battery voltage is between 11.9 and 11.5 volts. When the LED is "RED" the battery voltage is below 11.5 volts. You can of course, modify the trigger points by using the trimmer resistors and/or changing the value of the dropping resistors in the divider. __ Designed by Steven Weber, KD1JV
BattMan II: Build a Computer Controlled Battery Manager - BattMan iI is a computer controlled battery manager, intended for typical rechargeable batteries used by R/C and electronics hobbyists, as well as various consumer product batteries. __ Designed by Stefan Vorketter
Bench power supply - Back before we had computers to occupy all our time, my brother and I were always tinkering with motors and electronic junk and such. This required electrical power, and good power supplies were hard to come by, so we each ended up building our own. We had few parts and lots of time, so we each ended up taking apart and rewinding transformers at one time or another - I rewound the primary of a 220V transformer (from Germany) for 110V, Matthias rewound, I think, both windings of a transformer to convert it to 110V and put many taps in the secondary for various voltages. __ Designed by Markus Wandel
Bench power supply with buck converter with a linear afterburner - This project describes a power supply, fully controlled by a microprofessor. it is a cascaded approach, a step-down converter (LT1074) generates an intermediate voltage which is then linear regulated by a TiP-3055. So it is economical and low noise. As it is digital, output voltage ranges from 0 to 25.5 V and 0 to 2.55 A. You guess right. Resolution is 0.1 V and 0.01 A. __ Designed by Alexander C. Frank, aka Ajarn Changpuak
Bidirectional Power Inverter - 08/02/01 EDN Design Ideas: if you want to swap charge in either direction between unevenly loaded positive and negative battery buses, you need an inverting dc transformer. One implementation is the symmetrical flyback converter shown in Figure 1. The circuit Design by Tom Napier, North Wales, PA
Bipolar Power Supply with LM317t & with LM337t Controllable with Stereo Potentiometer - introduction LM317T and LM337T are well known and low cost adjustable voltage regulators with current limiting up to around 1.5A and power dissipation up to around 20W.it is useful to have bipolar...__ Electronics Projects for You
Breadboard supply-very Low dropout adjustable power supply - This project details the design of a very low dropout adjustable power supply. A good power supply is essential to electronic projects. While there are many existing designs for adjustable power supplies, this one makes improvements that make it more useful for hobby designs. __ Designed by © Lucky Larry
Broken Charger-Connection Alert - Detects if a device is not properly connected to its supply. Suitable for battery chargers, portable appliance supplies etc. __ Contact Flavio Dellepiane, fladello @ tin.it
Buck Mode Switching Regulator for Solar Applications - The purpose of a voltage regulator circuit is to take a variable input voltage and produce a steady output voltage. Two common regulator types are linear and switch-mode. Linear regulators are simple, but waste a lot of power in the process of regulating the voltage. Linear regulators can be thought of as self adjusting series resistors. Switch-mode regulators such as this one are much more efficient. Switch-mode regulators convert DC input voltages to pulses of high voltage DC. The DC pulses are used to charge a storage capacitor to the desired output voltage. The voltage is regulated by varying the width of the DC pulse __ Designed by G. Forrest Cook
Build a 10 Amp 13.8 Volt Power Supply - Sometimes amateurs like to home-brew their power supplies instead of purchasing one off the shelf at any of the major ham radio retail dealers. The advantage to rolling your own power supply is that it teaches us how they work and makes it easier to troubleshoot and repair other power supply units in the shack. it should be noted that there is no real cost advantage to building your own power supply unless you can get a large power transformer and heat sink for a super low price. Of course rolling our own gives us the ability to customize the circuit and make it even more reliable than commercial units. __ Designed by N1HFX
Build a breadboard power Module for integrateds - When I began building effects, I built directly on perfboard and sometimes, I had never before heard the circuit. This LED to, on a few occasions, being disappointed with the sound and later de-soldering the valuable parts and throwing away the rest. Other times, I would want to modify various components and would need the soldering iron for that as well. __ Contact holler @ runoffgroove.Com
Build a High Performance Voltage Regulator From Discrete Components - While integrated circuits have become a staple of all modern circuit designs, it is still possible to build circuits without IC ’s and still achieve a high level of performance. The circuit in Figure 1 is a high performance 5 volt voltage regulator built using discrete components that are readily available. I have used no IC ’s and I have even substituted a 1N4001 in lieu of a zener diode. The regulator output voltage varies by a mere .4% and has current limiting at 1.5 amps along with short circuit protection. With the exception of thermal shutdown, this circuit closely matches the performance of the 7805 5 volt regulator IC . __ Designed by N1HFX
Build a Low Cost Thermal Peak Detection NiCd Charger - The electric model aircraft and car industries have produced a bewildering array of field chargers for NIC d motor battery packs. These range from simple 6 or 7 cell chargers consisting of a resistor and mechanical timer, to more complex chargers with peak detection, cycling, and the ability to handle 36 cell packs __ Designed by Stefan Vorkoetter
Build a Simple Circuit Rechargeable CMOS
Battery - Occasionally we come across a computer motherboard that seems to eat those CR2032 batteries every 4 to 5 months. This is particularly frustrating because the computer works perfectly once booted but all the important BiOS settings are lost when the CR2032 battery fails. This is very irritating if the affected computer will not boot up with the default BiOS settings. I recently had a computer motherboard with this same irritating phenomenon. A test revealed that the current drain __ Designed by Radio Amateur Society of Norwich N1HFX |
