Free electronic circuit design and schematic diagram
High voltage applications can be found in various fields, such as ignition in internal combustion engine, gas igniter, cathode ray tube excitation, ionizer for dust odor catcher for air sanitary, ionic propulsion or many other things. The schematic diagram presented here shows a circuit of high voltage generator that can be used for various purposes. This circuit uses a 4049 […]
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The schematic diagram below show the circuit diagram of an RS232 to RS485 converter circuit. The EIA-485 standard, a.k.a TIA/EIA-485 or RS-485, is a physical layer standard defining the electrical properties of electronic drivers and receivers using balanced digital signal which is capable of handling multipoint systems. The ANSI Telecommunications Industry Association/Electronic Industries Alliance (TIA/EIA) is the organization who publish […]
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Current to voltage converter circuit can be made using a single resistor, it is very simple since any current will naturally develop a voltage when flow through a resistor. Using an active component, a small developed voltage on a resistor can be accurately measured since we can amplify it to reach a convenient level to be measured. A schematic diagram […]
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This circuit can provide 5,000 VDC from 26 VDC. This circuit has ripple of under 0.01% due to Voltage-doubling capacitors. As sinusoidal oscillator, a 2N217 transistor is used. The diode and the capacitors at the output stage should be of high voltage type. Here is the schematic diagram of the circuit:
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The circuit below is a logarithmic amplifier using an MC1556 op amp. The 10K pot is an offset adjustment. Here is a schematic diagram of one classic example of general purpose logarithmic converter circuit employing LM1556 op-amp: The popularity of logarithmic amplifier is decreasing as the microprocessor and microcontroller chips are getting lower and lower in price. Long time ago, […]
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This is a ADP1821 Step Down DC-to-DC Converter circuit. This circuit uses ADP1821 that is synchronous pulse-width-modulated (PWM), step-down controller, inexpensive and versatile. It can drive all N-channel power stage to regulate an output voltage as low as 0.6 V. The output voltages that can be provided by this circuit is from 0.6 V to 85% of the input voltage. […]
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This is a circuit of Voltage-to-Pulse Duration Converter. This circuit is used to convert voltage into pulse duration by combining a timer IC and an OP Amp. This circuit can obtain accuracy up to better than 1%. The output signal is independent of the input voltage and still retain the original frequency. Here is the circuit: [Source: Philips Semiconductors Application […]
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