Free electronic circuit design and schematic diagram
Typical circuit for welding equipment shown on the following circuit diagram. Turn on delay can be controlled accurately with Potentiometer P2. We can discharge C1 at each line zero voltage using DB1 diode bridge and R6-R7 resistors. The voltage charge will be reset at each new half line cycle and the turn-on delay will be maintained the same. Through both […]
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A step-down circuit used to approximately divide by two the rms voltage between the line input and the inductive load (L1) is shown on circuit diagram below. A turn-on delay of approximately 7 ms is provided by C2 and R3. We can discharge C2 at each line zero voltage using diode bridge, with diodes D1 and D2 and R2 resistor. […]
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Making a precision voltage source is easy, but not so easy if the voltage should be consistent over wide range of ambient temperature. Such requirement might be needed in high precision measurement system, for providing reference voltage in analog to digital conversion for example. Here is the circuit’s schematic diagram: The LM236, LM336 voltage references are easier to use than […]
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This shunt regulator acts like a Zener diode, but we can adjust the voltage (via a potentiometer). Here is the schematic diagram of the circuit: When the maximum load current is known, then we can choose Rs such as that Rload (at max current) and Rs form a voltage divider that gives a voltage level at slightly higher than the […]
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Usually, when an high heating of the application environment is occurred due to the power dissipation, we use high current linear solution to solve that problem. But, we can solve that problem using Adjustable 1.5A Step Down 1.5 MHz Switching Regulator circuit. This circuit use ST1S03 step down DC-DC converter. The ST1S03 can also used for powering low-voltage digital core […]
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On telecom applications, the MAX1637 is a popular device. This device offer a lot of advantages such as PWM operation, small size, high MOSFET-drive capability, wide VIN and VOUT ranges, and excellent protection against over- and under-voltage faults. An auto-retry controller that attempts to restart the system is often needed in telecom application. Here’s the circuit diagram: Undervoltage is related […]
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STANDBY/ON switch below is appropriate for applications (industrial and telecom, for example) in which the circuitry must remember its state (STANDBY or ON) after a power failure that occurs when there is no operator. Because the state can be lost if leakage current drains the battery, we can not just rely on an alternative approach based on battery (or supercapacitor) […]
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