Free electronic circuit design and schematic diagram
This regulator circuit stabilize the output voltage at 200V directly (without a transformer). Although the output voltage is high, this circuit only suffer a tension of the voltage drop (Vinput-Voutput), which is suffered mainly by the transistors. The op-amp suffers even less tension, since it regulate the applied voltage at their pins around the level of transistor’s bias voltage level. […]
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This circuit is high voltage regulator which has foldback current limiter protection. This circuit uses LM10 comparator with voltage reference, and this core integrated circuit is connected directly to high voltage circuitry. This high voltage direct connection is possible since the IC is inserted to a bias network and directly drop the applied voltage, so this IC is only suffering […]
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This is a transceiver saver circuit that protect a transceiver device (applicable to other device as well) from overvoltage of the power supply. This circuit is used to protect the device by regulating the power supply, avoiding damaging the device if overvoltage occurs. If the transceiver transmits current of above 2A, a heatsink should be used for the transistor. The […]
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This voltage regulator circuit gives a stable 5V output from unregulated inputs (more than 5V). The stability of the output voltage is good enough, only change less than 0.1 volts when the load current changes about 60mA. Here is the schematic diagram of the circuit: The basic principle of the voltage regulation rely on the mechanism of keeping the the […]
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Laboratory power supply is characterized by its wide adjustable voltage range and its robustness. Continuous voltage adjustment is necessary, as well as current limiter for safety and robustness. You can build suitable one using LM10 op-amp and voltage source IC as shown in the schematic diagram below: The output voltage is adjustable between 0-50V, with 1A maximum current. [Circuit’s schematic […]
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This is a Overvoltage Protected 5V Power Supply circuit. This circuit can be used to supply 74LS series integrated circuit and TTL. This circuit can protect the TTL or 74Ls series integrated circuit from damage because these ICs are easily damaged by short voltage spikes. This circuit uses a fuse which if the current rating is exceeded, the fuse will […]
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This discrete voltage regulator has complete features that is equivalent with modern voltage regulator integrated circuit (IC). It’s not cheaper if you build discrete one like this, but it’s always interesting to study the schematic diagram to learn how it works. Here is the schematic diagram of the circuit. Volatge Regulation Look at the 6,8k resistor, it should be dotted […]
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