DC servo motor driver
https://www.electronics-lab.com/project/dc-servo-motor-driver/
Description DC Servo Motor Driver kit, designed using MC33030 IC, is the fastest and low cost way of getting your DC Servo Motor up and running. Input – 12 VDC Output – can drive upto 1 A Load Overcurrent shutdown, overvoltage shutdown Programmable reference input Power-On LED indicator Relimate connector for interfacing the kit Four […]
High current bipolar stepper motor controller
https://www.electronics-lab.com/project/high-current-bipolar-stepper-motor-controller/
Description High Current Bipolar Stepper Motor Controller kit is based on chopper drive. Chopper drive is a method of providing a constant current source to a device. Chopper drive allows for use of higher voltage power supply for better performance and higher speed. It is uses SGS Thomson’s L297 and L298 controller IC’s. Logic supply […]
5 Lamp / LED Flash Driver
https://www.electronics-lab.com/project/5-lamp-led-flash-driver/
Description General Description of the following circuit. This circuit is based around HT2050 manufactured by HOLTEK semiconductors. It is a low cost, low-power C-MOS LSI designed for lamp and LED flash driver. It requires minimum external components.You can operate it with just two AAA cell or 3v Battery.Circuit has five flash outputs with 10mA drive […]
Low cost / Automatic Emergency Light
https://www.electronics-lab.com/project/low-cost-automatic-emergency-light/
Description Here is a white-LED-based emergency light that offers the following advantages: It is highly bright due to the use of white LEDs. The light turns on automatically when mains supply fails, and turns off when mains power resumes. It has its own battery charger. When the battery is fully charged, charging stops automatically. The […]
Automatic Fan Controller
https://www.electronics-lab.com/project/automatic-fan-controller/
Description Th1, the 50K thermistor, is a standard type. Mine was a bar or rectangular looking thingy. Available from Tandy/Radio-Shack. Almost any type will do. I experimented with different models from 22K to 100K and all worked fine after replacing the trimmer pot. The one used in the above circuit diagram was a 50K model. This […]
Simple DC motor PWM speed control
https://www.electronics-lab.com/project/simple-dc-motor-pwm-speed-control-2/
The 555 is ubiquitous and can be used as simple PWM speed control Description The 555 Ic is wired as an astable and the frequency is constant and independent of the duty cycle, as the total resistance (R charge + R discharge, notice the diode) is constant and equal to 22Kohm (giving a frequency […]
On-Off Temperature Control
https://www.electronics-lab.com/project/on-off-temperature-control/
This circuit controls a load (in this case a dc brushless fan) based on a temperature compared with a setpoint. THe transduced is a diode in the forward polarization regime. In fact when forward biased, the forward voltage drop accross a diode has a temperature dependance, in particular has a negative linear(ish) slope. This because […]
Sound Level Indicator
https://www.electronics-lab.com/project/sound-level-indicator/
This project uses an LM3915 bar-graph IC driving two sets of ten LEDs for a 30dB range. The circuit is unique because it has an additional range of 20dB provided by an automatic gain control to allow it to be very sensitive to low sound levels but it increases its range 20dB for loud sounds. […]
2500W Phase Control
https://www.electronics-lab.com/project/2500w-phase-control/
This circuit controls resistive and inductive loads up to 2,500W. Its main functional device is an integrated phase control circuit – Siemens TLE3103. It contains its own power supply, a zero voltage crossing detector circuit and a logic driver. An additional feature is the low voltage input to enable/disable triac firing enabling/disabling the logic driver. […]
BitCake – Electronic Birthday Cake
https://www.electronics-lab.com/project/bitcake-electronic-birthday-cake/
Impress your friend with the ultimate geek’s Birthday Cake! A hand-made open source electronic cake with candles you can blow out! Specifications Features 9 LED candles that you can blow on, to make them flicker and go out, like you do with a real birthday cake! Each candle blinks with random period and phase that […]