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Circuits Designed by Dave Johnson, P.E. : |
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CMOS
Schmitt Trigger IC Makes VCO - By changing the supply voltage fed to a classic 4584 Schmitt trigger type oscillator, the oscillator frequency can be changed over a range of 50:1. A 74HCU04 inverter is used at the output of the 4584 to maintain a constant TTL logic level signal. . . Circuit by David A. Johnson P.E.-December, 2002 VCO from CMOS
Schmitt Trigger IC - By changing the supply voltage fed to a classic 4584 Schmitt trigger type oscillator, the oscillator frequency can be changed over a range of 50:1. A 74HCU04 inverter is used at the output of the 4584 to maintain a constant TTL logic level signal . . . Hobby Circuit designed by Dave Johnson P.E.-March, 2002 |
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Links to electronic circuits, electronic schematics and designs for engineers, hobbyists, students & inventors:
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An Ultra Low Distortion Audio Test Oscillator - This project was published in the March 2010 issue of the Australian magazine "Amateur Radio", and uses a unique circuit and cheap readily available components to achieve laboratory grade performance. :-) __ Designed by VK5JST / VK5TR Audio Test Oscillator - As a piece of test equipment, an audio oscillator has to be considered essential for anyone working in with hi-fi gear. Together with an audio millivoltmeter (as described in Project 16) , and even better if you have access to an oscilloscope, you will be able to make proper measurements on everything from preamps, RIAA equalisation stages (for vinyl disks) , tone controls, crossover networks, etc __ Designed by Rod Elliott ESP
CMOS
Schmitt Trigger IC Makes VCO - By changing the supply voltage fed to a classic 4584 Schmitt trigger type oscillator, the oscillator frequency can be changed over a range of 50:1. A 74HCU04 inverter is used at the output of the 4584 to maintain a constant TTL logic level signal. . . Circuit by David A. Johnson P.E.-December, 2002 |
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Miniature Audio Oscillator - The Miniosc, low distortion battery powered audio oscillator __ Designed by Rod Elliott ESP
Simple Circuit Audio Oscillator - As a piece of test equipment, an audio oscillator has to be considered essential for anyone working in with hi-fi gear. Together with an audio millivoltmeter (as described in Project 16) , and even better if you have access to an oscilloscope, you will be able to make proper measurements on everything from preamps, RIAA equalisation stages (for vinyl disks) , tone controls, crossover networks, etc __ Designed by Rod Elliott ESP |
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VCO from CMOS
Schmitt Trigger IC - By changing the supply voltage fed to a classic 4584 Schmitt trigger type oscillator, the oscillator frequency can be changed over a range of 50:1. A 74HCU04 inverter is used at the output of the 4584 to maintain a constant TTL logic level signal . . . Hobby Circuit designed by Dave Johnson P.E.-March, 2002 |
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Oscillators: Audio
Circuits |
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