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All items written by Merlin Blencowe
Wideband Wien Oscillator with Single-Gang Pot
July 1, 2013 by Merlin Blencowe

Wideband Wien Oscillator with Single-Gang Pot

This Wien bridge oscillator (after Max Wien, 1866–1938) produces a low-distortion sine wave of constant amplitude, from about 15 Hz to 150 kHz. It requires just four opamps and will work off a single 9-volt battery. Also, unlike most Wien bridge oscillators, it does not require a dual-gang potentiometer for tuning.
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Glass Blower
July 1, 2010 by Merlin Blencowe

Glass Blower

Most guitar pedals obtain a high input impedance simply by using a large resistor at the input of the first opamp, but this generates a good deal of noise due to the input bias current. The Glass Blower avoids this by using a smaller resistance (R2) which is bootstrapped by C2 to an effective value of tens of megohms.
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STEMTera, a Proper Way to Do Arduino
December 12, 2019

STEMTera, a Proper Way to Do Arduino

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Review: Bench-top Power Supply PeakTech PSU 6225A
November 14, 2019

Review: Bench-top Power Supply PeakTech PSU 6225A

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Free Back Article: 0-30V Lead-acid Battery Activator
November 20, 2019

Free Back Article: 0-30V Lead-acid Battery Activator

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PCBite: Measure Hands-Free on Your PCB
December 4, 2019

PCBite: Measure Hands-Free on Your PCB

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Free Fresh Article: Arduino Temperature Recorder
November 28, 2019

Free Fresh Article: Arduino Temperature Recorder

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