Charles H Small

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Design Ideas detail novel power supplies

You can employ a pin-limited microcontroller to develop a suitable dc/dc-boost-voltage converter with the aid of a few discrete components. Tiny microcontroller hosts dual dc/dc-boost converters details a simple circuit where a microcontroller powered by an AAA cell generates a high enough voltage to backlight an LCD. Small capacitor supports telecom power supply during brownouts shows... More

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Design Ideas interface to microcontrollers

The Design Idea in Circuit and software provide accurate recalibration for baseline PIC microcontroller’s internal oscillator uses three I/O lines to recover the internal calibration value by recalibrating against a reference clock, the 4-MHz crystal. The method in Microcontroller moving-dot display interface uses three I/O lines needs three output lines—data, clock, and... More

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Design Ideas control synthesizers

Peltier devices, also known as solid-state refrigerators, or TECs (thermoelectric coolers), actively cool temperature-sensitive electronic components, such as optical detectors and solid-state lasers. However, one TEC data sheet proviso that designers sometimes miss is that you always measure these parameters with the TEC mounted on an effectively zero-thermal-impedance—that is,... More

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Design Ideas interface to precision circuits

Chop the noise gain to measure an op amp’s real-time offset voltage introduces a new type of chopping. "Chopping the noise gain" is a simple way to measure the offset voltage in real time, so that you can subtract it and enhance DC precision. The circuit in Simple analog circuit provides voltage clipping and dc shifting for flash ADC converts a symmetrical inputvoltage range of... More

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Design Ideas test circuits under load

To discover potential power-supply problems, you must run dynamic and static tests. The simple current sink in Precision voltage-controlled current sink tests power supplies tests low- to medium-power supplies and voltage sources. The current sink can draw current of 0 to 1.5A for an input-voltage range of 0 to 5V with a supply voltage as high as 20V. Ordinary red LEDs normally function as... More