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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.

  • 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.

Electronic Projects

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Digital multi-meters are found dirt cheap on Ebay. For less than five bucks, you can buy a multi-fu
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Temperature, Air Pressure, and Altitude on a GUI using Raspberry Pi Pico, Bosch BMP280, and LVGL
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555 VCO (Voltage Controlled Oscillator) uses constant current control to give wide control range.
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Paralleling LM317 regulators for higher current, using TL431 reference for excellent performance
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Circuit separates combined turn/stop signals for separate turn/stop lamps using no added power
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Easy to build digital coil-less (100KHz step size) FM transmitter
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Radio push-button function is provided by a simple circuit using a CD4011 in a latch configuration
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TL431 provides accurate, adjustable voltage crowbar function for circuit overvoltage protection
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LV, LP, CC driver allows two alkaline or NiMH cells to steadily power a Red LED until discharged.
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Low parts-count circuit monitors multiple alarm switches, includes arm and entry delays
5.00 star(s) 1 ratings
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Weight Scale using SFE's OpenScale platform
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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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Circuit disconnects battery from operating accessories at a specific voltage to avoid dead battery.
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