Wide Input-Voltage Range High-Power LED Driver

This is a wide input-voltage range high-power LED driver circuit. This circuit based on a buck/boost converter controller regulates current to a white LED. This circuit can be used to replace incandescent bulbs, it efficiently match the LEDs to available power sources such as electrical systems car, batteries, etc. It also can used to control and regulate the LED output […]

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A 20-kHz, Third-Order Low-Pass Filter

This is a third order low pass filter that has corner frequency of 20kHz. It is twice as high as the auto-zero clock frequency. Here is the circuit : The input signal operation is allowed to across its entire gain bandwidth because intermodulation¬† and aliasing noise are highly attenuated. This circuit also has rail-to-rail drive capability provided by amplifier’s output, […]

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Temperature Measurement via Thermocouple

This is a temperature measurement circuit using thermocouple. This is a low-frequency application. It will allow the OPA335 to be switched directly into the signal path. This circuit has low noise, high accuracy, and low drift. Here is the circuit : The 4.096-V bridge supply is provided by a precision voltage reference. A negative temperature coefficient of¬† diode D1’s forward […]

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JFET Nixie Tube Driver

This is a driver circuit for nixie tube. This circuit uses 2N3684 as nixie tube drivers because its Vp is 2-5 volts which is ideally matches TTL-DTL logic level. Compared with bipolar transistor, the JFET is immune to almost all of the failure mechanism found in bipolar transistor. Here is the circuit : To prevent breakdown of the JFETs, this […]

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