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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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Lead-acid battery charger using LM317 provides auto CC charge, CV top-off, and final trickle-charge
5.00 star(s) 2 ratings
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PB latch circuit provides on/off delay function to prevent accidental power switching
0.00 star(s) 0 ratings
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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.
4.00 star(s) 1 ratings
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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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Combination of Binary & BCD counters do Binary↔BCD conversions.
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PB alternate action circuit uses CD4013 FF with simple debounce to control relay (or other load).
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Capacitor resonant charging can nearly double the charge efficiency and quadruple energy stored.
5.00 star(s) 1 ratings
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Circuit outputs the min. or max. value of several analog inputs, or provides accurate bi-level clamp
5.00 star(s) 1 ratings
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Watchdog timer circuits, will timeout on either high or low hang
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Just for fun I designed and built this simple circuit which drives a monostable relay by a singol m
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CD4106 PWM circuit uses only 2 diodes, 1 capacitor, and 1 potentiometer
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Circuit generates Av=+1 with simple offset calculation using std. resistor values
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PWM circuit has voltage control of 0% to 100% duty-cycle
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Solid-state discrete AC/DC relay uses MOSFETs for low on-voltage with opto-isolated control input
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Rework Station, Component Salvage
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AC/DC Low-Side AC Switch With Low ON Resistance Uses Two N-MOSFETs and One PNP Transistor
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