Free electronic circuit design and schematic diagram
This battery charger circuit use a flyback converter topology, and implements a current-limited power supply to charge lead-acid batteries. Here is the schematic diagram of the charger circuit: The flyback transformer provide isolation and voltage input range flexibility, event at supply voltage lower that the battery voltage. Monitoring the charging current is done by sensing the output using MAX471 current […]
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This current sensing circuit sense the current at the high side (between positive supply and load). This circuit take the benefit of the microampere supply current and Rail-to-Rail input of the LT1494 op-amp. Here is the schematic diagram of the circuit: Look at the op-amp, the inverting input is connected directly to the output, and this negative feedback will keep […]
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The Battery Charger Circuit This lead acid battery charger circuit design is very simple and smart. I call it a smart battery charger design because it uses only few components to support many features. Here is the schematic diagram of the circuit: This circuit is suitable for a general purpose lead acid battery charger, or for a charger modul that […]
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The DC to AC inverter circuit shown in the schematic here is very simple circuit since it produce square wave, but it’s enough to power many devices. Here is the schematic diagram of the inverter circuit: The MOSFET is configured as bridge, so the current will flow alternatively in through the primary windings of the transformer. The most expensive part […]
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If you are a hobbyist or a professional electronic engineer who make many electronic experiment, troubleshooting, or testing, providing wide range variable voltage power supply in your lab or workshop will make your life easier. You can build your variable power supply using linear adjustable regulator, but switching technology let you design a very wide voltage adjustment range without loosing […]
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By detecting a voltage drop in resistor connected in series with the battery, we can measure the current flowing in or out of the battery. A simple differential amplifier do that, but we need both positive supply and negative supply to sense the current in both direction, the current when charging and discharging the battery. We can use a single […]
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A LT1637 is advertised as 1.1MHz, 0.4V/us Over-The-Top Micropower, Rail-To-Rail Input and Output Op Amp. This features are suitable for current sensing application since input voltages are right at the upper rail. The circuit show current sensing of 5V supply system, but monitoring up to 44V application can be done by this circuit (the maximum supply voltage of the op-amp). […]
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