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  1. Push-Button Relay Latch Circuit With Simple Debounce crutschow
    PB alternate action circuit uses CD4013 FF with simple debounce to control relay (or other load).
  2. Resonant Inductive Charging of Capacitor Improves Efficiency And Amount of Stored Energy crutschow
    Capacitor resonant charging can nearly double the charge efficiency and quadruple energy stored.
  3. Analog Max / Min Value or Bi-Level Clamp Circuits crutschow
    Circuit outputs the min. or max. value of several analog inputs, or provides accurate bi-level clamp
  4. Missing Pulse Detector Circuits Using LM339/393 Comparator or CD4049 Gate crutschow
    Watchdog timer circuits, alternate to 555 designs, will timeout on either high or low hang
  5. Low Power CMOS PWM Circuit With Buffer Output Requires Only 5 Components crutschow
    CD4093 PWM circuit uses only 2 diodes, 1 capacitor, and 1 potentiometer
  6. Single Supply Non-Inverting Av=1 Op Amp Circuit With Simple Offset Voltage Calculation crutschow
    Circuit generates Av=+1 with simple offset calculation using std. resistor values
  7. Simple PWM Circuit For Lamp Dimming, etc., Improves On 555 PWM Circuits crutschow
    PWM circuit has voltage control of 0% to 100% duty-cycle
  1. Mosaic

    Auto Ah Capacity Tester & Logger for 12V lead acid Batteries

    Safe, autonomous Ah capacity testing with auto shutdown & recharge option.
    0/5, 0 votes
    Updated:
    May 5, 2014
  2. Val Gretchev

    Constant Current Diode

    A component that is often overlooked.
    0/5, 0 votes
    Updated:
    Apr 3, 2014
  3. Val Gretchev

    Obscure but Interesting Circuits

    Having fun with logic gate circuits that may be useful.
    0/5, 0 votes
    Updated:
    Apr 1, 2014
  4. kinarfi

    FORWARD & REVERSE, VARIABLE SPEED MOTOR CONTROLLER

    FORWARD & REVERSE, VARIABLE SPEED MOTOR CONTROLLER WITH POTENTIOMETER
    0/5, 0 votes
    Updated:
    Jan 11, 2014
  5. alec_t

    PWM pulse generator

    This is the base design (not a full working drawing with pin-numbering etc) for a simple PWM pulse
    0/5, 0 votes
    Updated:
    Sep 3, 2013
  6. alec_t

    Brushless DC Motor Speed Controller

    A simple, cheap, BLDC motor controller using readily-available components is described. Most previ
    5/5, 2 votes
    Updated:
    Feb 14, 2013
  7. alec_t

    The versatile CD4093B Schmitt NAND IC

    Schmitt logic gates such as in the CD4093 quad NAND gate IC are useful buiding blocks for various f
    0/5, 0 votes
    Updated:
    Jan 17, 2013
  8. 3v0

    COOP BUILD: Breadboard Trainer/Lab/Breadboard Buddies

    This is the master index for all completed modules for this project. Please PM 3v0 if you have upl
    0/5, 0 votes
    Updated:
    Oct 13, 2012
  9. ElectroMaster

    Simple Lie Detector

    Here's a simple lie detector that can be built in a few minutes, it is mean for fun and is obviousl
    0/5, 0 votes
    Updated:
    Sep 9, 2011
  10. sheldonstv

    Simple gated oscillator

    Here is a simple gated oscillator for you to play with. It's nothing complicated build wise but
    0/5, 0 votes
    Updated:
    Sep 9, 2011
  11. ElectroMaster

    Jeopardy Quiz Game

    This electronic "Jeopardy" game circuit consists of four push-button switches. When one is pressed,
    0/5, 0 votes
    Updated:
    Jun 21, 2011
  12. 3lectrix

    Digital Code Lock

    This is a simple but effective code lock circuit that has an automatic reset facility. The circuit
    0/5, 0 votes
    Updated:
    Jun 16, 2011
  13. ElectroMaster

    Garage Door Hacker

    This is the instructions and schematic for a garage door hacker. It modifies an existing door opene
    0/5, 0 votes
    Updated:
    Jul 5, 2010