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Last Updated on: Thursday, April 07, 2016 01:00 PM

Circuits Designed by Dave Johnson, P.E. :
  • 1 Watt Fluorescent Lamp Night Light -  If you are tired of replacing small night light lamps, try this circuit. The line powered circuit uses a long life cold cathode fluorescent lamp. A simple charge pump technique runs the lamp without any transformer . . . [Circuit by Dave Johnson P.E.,  03/26/99]

  • 1.5v LED Flasher Version A -  Many published circuits that flash LEDs need 3 volts or more. This circuit uses only a single inexpensive C-MOS IC and flashes the LED for a full year on a single 1. 5 volt AA alkaline battery cell. The circuit uses a charge pump technique to provide . . . [Circuit by Dave Johnson P.E.,  06/04/00]

  • 10 LED Sequential Flasher using Low Powr -  A while back I posted a flasher circuit which flashed 10 LEDs sequentially. That circuit was powered by four AA alkaline cells. The circuit below operates much the same way but has been modified to run from a single 3v CR2032 lithium coin cell . . . [Circuit by Dave Johnson P.E.,  04/17/11] 

  • 12 Volt Lite/Dark Lamp Switch -  Often, for certain low voltage lighting systems; you would like to turn off the lights during the bright light of the day. Most commercial day/night switches are designed for AC lighting. The circuit below was designed for a 12v DC system. But, it could be modified for other voltage as well. It uses an inexpensive phototransistor as the light detector.  . . . [Hobby Circuit designed by David Johnson P.E.,  06/30/08]


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

C acts as dedicated motor control -  09/11/98 EDN Design Idea   (Scroll to find this circuit design)   Motion-control systems often use a PWM signal to control the duty cycle for a motor driver or Amplifier module. Typical designs generate the PWM signals using C with dedicated PWM output lines, such as the PIC16C65 (Microchip Technology, www. microchip. com) and the HC11 (Motorola Inc, www. motorola. com). However, these C may have more features than necessary for a motion-control system with multiple degrees of freedom. . . .  [by Dylan Horvath, Gecko Sysytems Inc, Austin, TX]

 

C controls charge pump as background task -  08/01/97  EDN Design Idea   Because of power consumption and cost, designers of battery-powered devices mainly choose components that run at 3V or lower. Unfortunately, many devices operate only at 5V, including LCDs with built-in drivers, programming lines of. . .  [by Carlos Cossio, Santander, Spain]

 

C implements pushbutton light dimmer -  06/18/98 EDN Design Idea   (Several design ideas on this page, scroll to find this one)  Four ICs--a multiplier, a sync separator, an op Amp, and a dc-restore IC--along with a handful of passive components can implement a complete AGC and dc-restore circuit for video signals (Figure 1). . . .  [by William Grill, Riverhead Systems, Littleton, CO]  

 C Provides Wireless Keypad Control -  10/08/98 EDN Design Idea   (Several Design Ideas, scroll to find this one. )  The circuit in Figure 1 is a simple, 4X4 keypad remote-control system. A 68HC705J1A C, IC1 (Figure 1a), costs less than $1 and controls the keypad functions. When you depress any key, the C provides a 4-bit hex-data output and then enables a latch signal to latch the data into IC2. Next, the C enables IC2 to transmit the signal to the IC3 encoder to convert the 4-bit hex data to serial data to send to IC4. IC4, the RF data-transmitter module, mixes the serial data with the 315-MHz carrier frequency to transmit. . . .  [by Lloyd Khuc, Motorola Inc, Austin, TX]

 

0 to 10 Volt Control for RC Servos -  This circuit takes standard 0-10V control voltage (for example from analogue light controlling desk) and outputs a standard 1-2 ms RC servo motors control pulse. . . .  [Tomi Engdahl's web]

 

0-10V control for RC servos -  This circuit takes standard 0-10V control voltage (for example from analogue light controlling desk) and outputs a standard 1-2 ms RC servo motors control pulse. . . .  [Tomi Engdahl]

1 component drives stepper motor -  The extremely simple circuit in Fig 1 drives a stepper motor directly from 12V ac , 60 Hz power supply. Usually you need switched-dc voltages to drive a stepper motor. But a stepper motor will run off ac lines if you introduce a 90 phase shift between the voltages applied to the motor's two windings. In this case only one 6. 8uF non polarity capacitor is needed. . . .  [ info @ wzmicro.com]

 

1 FET controls LED array -  04/12/01 EDN Design Idea   White-LED backlights are gaining acceptance because they offer higher reliability and simpler drive circuitry than backlights based on CCFL (cold-cathode-fluorescent-lamp] and EL (electroluminescent] technology. As a result, white-. . .  [by Len Sherman, Maxim Integrated Products, Sunnyvale, CA]

 

1 processor pin controls on/off function -  04/29/04  EDN Design Idea   A recent Design Idea   prompted me to offer the simpler solution that I used in a recent project (Reference 1]. We needed a momentary power switch with processor supervision. This supervision would allow the processor to delay a powe. . .  [by Michael Sirkis, Radio Systems, Logan Township, NJ]

 

1 switch controls digital potentiometer -  09/19/02  EDN Design Idea   This Design Idea   is an evolution and simplification of another (Figure 1, Reference 1]. Replacing the three inverted-input NOR gates with their logical equivalents, positive-input NAND gates, makes these three gate symbols consistent. . .  [by im Bach, Delphi Delco Electronics Systems, Kokomo, IN]

 

1 Watt Fluorescent Lamp Night Light -  If you are tired of replacing small night light lamps, try this circuit. The line powered circuit uses a long life cold cathode fluorescent lamp. A simple charge pump technique runs the lamp without any transformer . . . [Circuit by Dave Johnson P.E.,  03/26/99]

 

1 Wire Barometer -  By using a dual voltage supply, instrument precision and/or instrument range can be improved without adding significantly to the parts count. . . .  [from A.G. Miller's web site]

 

1 wire brings power & data to LCD module -  01/27/14 - EDN Design Idea   If you need to connect a small remote LCD display, or your C has run out of I/O pins, heres a good, cheap solution - Embedded systems frequently use HD44780 - type LCD displays as it is considered the most popular alphanumeric display controller. The interface comprises at least 14 pins: eight for data, three for control (EN, WR, RS), two for power supply (Vdd, Vss), and one for contrast (Vre). Configured in 8 - bit mode, it requires at least 10 I/O lines (D0D7, EN, RS). Configured in 4 - bit mode, it requires at least six I/O lines (D4D7, EN, RS). . .  [by Benabadji Noureddine]

 

1.5v LED Flasher Version A -  Many published circuits that flash LEDs need 3 volts or more. This circuit uses only a single inexpensive C-MOS IC and flashes the LED for a full year on a single 1. 5 volt AA alkaline battery cell. The circuit uses a charge pump technique to provide . . . [Circuit by Dave Johnson P.E.,  06/04/00]

 

10 Channel LED Sequencer -  The 4017 is a CMOS decade counter with 19 decoded outputs.   Inputs include a RESET (pin 15) , and a CLOCK INHIBIT (pin 13).   The clock input drives an. . .  [Bill Bowden]

 

10 Channel Light Controller -  A 10 channel light controller using pwm/ up to 1a per channel at 12v. . .  [by P. Townshend - EduTek Ltd]

 

10 LED Sequential Flasher using Low Powr -  A while back I posted a flasher circuit which flashed 10 LEDs sequentially. That circuit was powered by four AA alkaline cells. The circuit below operates much the same way but has been modified to run from a single 3v CR2032 lithium coin cell . . . [Circuit by Dave Johnson P.E.,  04/17/11]

 

10A μModule step-down regulator with advanced input and load protection -  07/01/15  EDN Design Idea   This switcher design has comprehensive electrical and thermal protection, and high efficiency over wide input-output ranges. . . .  [EDN Design Idea]

 

12 Volt Differential Temperature Controller -  for hot water and hot air system control. . .  [G. Forrest Cook]

 

12 Volt Lamp Dimmer (using a pot) -  Here is a 12 volt / 2 Amp lamp dimmer that can be used to dim a standard 25 watt automobile brake or backup bulb by controlling the duty cycle of a astable 555 timer oscillator. When the wiper of the potentiometer is at the uppermost position, the capacitor will charge quickly through both 1K resistor. . .  [Bill Bowden's website]

 

12 Volt Lamp Fader (LEDs or incandescent) -  This circuit is similar to the "Fading Red Eyes" circuit (in the LED section) used to fade a pair of red LEDs. In this version, the lamps are faded by varying the duty cycle so that higher power incandescent lamps can be used without much power loss. The switching waveform is generated by comparing two linear ramps . . .  [Bill Bowden's website]

 

12 Volt Lite/Dark Lamp Switch -  Often, for certain low voltage lighting systems; you would like to turn off the lights during the bright light of the day. Most commercial day/night switches are designed for AC lighting. The circuit below was designed for a 12v DC system. But, it could be modified for other voltage as well. It uses an inexpensive phototransistor as the light detector.  . . . [Hobby Circuit designed by David Johnson P.E.,  06/30/08]

 

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Control Circuits:   #'s       A's       B-C       D-E       F-G    
H-I        J-L        M-O        P-Q        R        S        T-U        V-Z


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