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Switch Circuits
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Last Updated: August 25, 2015 10:18 AM

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 David Johnson P.E.,  03/26/99]

  • 1.5V Touch Activated Switch -  A single 1. 5v silver oxide button cell powers this complete touch activated switch circuit for 5 years. It features both a normally open and a normally closed set of solid-state switch thermals. It also has an adjustable sensitivity, which can be set for a touch capacitance change as small as 1 picofarad.  . . . [Circuit by Dave Johnson P.E.,  01/18/02]

  • 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]

  • 120 VAC Touch Switch -  This is a capacitance based touch on/touch off switch, which can control power to a 200 watt 120vac load . . . [Circuit by David Johnson P.E.,  07/11/06]

  • 12v 24v AC and DC Day/Night Switch -  The circuit uses a bridge rectifier circuit to convert AC into DC. A 12v zener diode limits the operating voltage of the circuit to 12v. A tiny Schmitt trigger inverter and a phototransistor detects the ambient light intensity. If there is sufficient light, the inverter disables a push-pull oscillator circuit . . . [Hobby Circuit designed by Dave Johnson P.E.,  03/25/12]

  • 12v Light/Dark Lamp Switch -  At night, this circuit will route current to a 12v lamp, turning it on . . . [Circuit by David Johnson P.E.,  07/09/06]

  • 12v Touch Switch Exciter Circuit -  This circuit is designed to generate a 20KHz pseudo sine wave signal that can power about 50 remote touch activated switch circuits.   It can support a cable length of about 2500 feet.   A typical remote switch circuit is also shown as well as a receiver circuit for those switches.  . . . [Circuit by David A. Johnson P.E.,  02/10/02]

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

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]

1 oscillator drives multiple solid-state relays -  03/16/06  EDN Design Idea   A conventional electromechanical relay often makes sense for switching large amounts of load current on and off and when proportional control of the loads current or voltage is unnecessary. . .  [by Juan Ramn Vadillo Pastor, SOR Internacional SA, Saint Quirze Del Valles, Barcelona, Spain]

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 power. . .  [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 switch selects one of three signals -  03/02/06  EDN Design Idea   Total cost is less than $1 - Low-cost, easy-to-use design allows monitoring of peripherals, sensors. . .  [by Felix Matro, JL Audio Corp, Phoenix, AZ]

1 switch serves dual duty in small, microprocessor-based system -  03/30/06  EDN Design Idea   Low-cost, easy-to-use design allows monitoring of peripherals, sensors. . .  [by Steve Hageman, Windsor, CA]

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 David Johnson P.E.,  03/26/99]

1.5V Touch Activated Switch -  A single 1. 5v silver oxide button cell powers this complete touch activated switch circuit for 5 years. It features both a normally open and a normally closed set of solid-state switch thermals. It also has an adjustable sensitivity, which can be set for a touch capacitance change as small as 1 picofarad.  . . . [Circuit by Dave Johnson P.E.,  01/18/02]

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]

10 Reasons to Upgrade to a 16800 or 16900 Series Logic Analyzer  -  Application Note. . .  [Aligent]

100 Seconds Duration On Switch with Touch Control -  This is a touch control switch which keeps the circuit on about 100 seconds after touching the plate connected to the 2 numbered pin. At the end of this time duration, relay releases and the circuit gets to off position. The impedance of the trigger input of the 555 timer IC is very high and the inductive voltage on the human body is enough to trigger it. The circuit works based on this principle. You can use a piece of metal as a plate. The circuit can be used in toy circuits, buzzers or any project that is suitable. You can adjust the duration time by changing the R1 and C1 values. . . . 

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]

120 VAC Touch Switch -  This is a capacitance based touch on/touch off switch, which can control power to a 200 watt 120vac load . . . [Circuit by David Johnson P.E.,  07/11/06]

12v 24v AC and DC Day/Night Switch -  The circuit uses a bridge rectifier circuit to convert AC into DC. A 12v zener diode limits the operating voltage of the circuit to 12v. A tiny Schmitt trigger inverter and a phototransistor detects the ambient light intensity. If there is sufficient light, the inverter disables a push-pull oscillator circuit . . . [Hobby Circuit designed by Dave Johnson P.E.,  03/25/12]

12V 10A Dark Activated Switch -  The DAS1 kit can be used to automatically turn on 12V lamps when it becomes dark. It has an on-board switch for selecting Off, Always On and On-at-Dark (Auto) operation. The DAS1 can control up to 10 Amps of 12V DC lighting, it also includes two ultra-bright white LEDs for a low power self-contained light source. The DAS1 is perfect for controlling external arrays of 12V white LED lamps, 12V fluorescent lamps and 12V incandescent lamps. Use it for indoor/outdoor accent lighting, street lighting, security lights, automatic highway signs and more. . . .  [Solar Orbit Kit]

12v Light/Dark Lamp Switch -  At night, this circuit will route current to a 12v lamp, turning it on . . . [Circuit by David Johnson P.E.,  07/09/06]

12v Touch Switch Exciter Circuit -  This circuit is designed to generate a 20KHz pseudo sine wave signal that can power about 50 remote touch activated switch circuits.   It can support a cable length of about 2500 feet.   A typical remote switch circuit is also shown as well as a receiver circuit for those switches.  . . . [Circuit by David A. Johnson P.E.,  02/10/02]

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Switch Circuits
Switches:  #'s       A-B       C-D       E-G       H-L        M-O       P-R      S-T      U-V      W-Z


HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


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