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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

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Cooling FAN Controller Using an LM35 (No MCU)
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A Sallen-Key Active-Filter can be built using BJTs instead of an op amp
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Altium Designer 5 Useful Design/Routing Tips
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All digital one-shot circuit generates precise, selectable pulse-widths
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Digital one-shot generates precise pulse width with no RC components.
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1-Quadrant Analog Multiplier Circuit Uses PMW Circuit For DC to Low Frequency Signals
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Digital FM Receiver using Arduino and TEA5767
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Open Source Hand Sanitizer Dispenser with Laser-Cut Enclosure [Pro]
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Dog Bowl Monitor using Simple Weight Scales and HX711 Sensor
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555 VCO (Voltage Controlled Oscillator) uses constant current control to give wide control range.
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Charger performs recommended charging function for rechargeable NiZn batteries
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Lead-acid battery charger using LM317 provides auto CC charge, CV top-off, and final trickle-charge
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PB latch circuit provides on/off delay function to prevent accidental power switching
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Circuit combines PWM controlled constant-current source with 3rd-order filter using one opamp
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Stepper motor driver applies full voltage for fast stepping, then PWM for low power hold
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Circuit generates an equivalent high power resistance that can be adjusted with a potentiometer.
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A simple circuit using the common CD4049 to generate the Radio PB Function
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Notch filter Q is largely independent of component tolerances and notch frequency adjustment.
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Circuit applies full actuation power to solenoid with PWM hold reducing power to 12-25% of nominal
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