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Switch Circuits, page 4
Switches #'s-B        C-G        H-L      M-O       P-S      T-Z
Last Updated on: Sunday, November 09, 2008 05:13 PM
 

 
Circuits Designed by Dave Johnson, P.E. :
  • Miniature Pushbutton On/Off Switch   NEW
    In many battery powered devices, you would like to turn the circuit on and off by pressing a small pushbutton switch.  One press turns the device on and second press turns it back off.  The flip/flop circuit below uses a minimum number of parts to perform this function.  It operates from DC supply voltage which can range from 2v to 6v.  It draws very little current and takes up little space.  Yet, it can control up to one amp of current.  The circuit uses a single flip/flop device made by Texas Instruments. ...

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

Macros for Page and Bank Switching:  Microchip Application Note - Published 26-Aug-97   (added 2/06)

Magnetic Proximity Switch:  (Electronic Circuit / Schematic added 10/04)

Mc Implements Pushbutton Light Dimmer :  06/18/98 EDN-Design Ideas  / (Circuit / schematic design added 6/06)

Measuring Jitter in Digital Systems (AN 1448-1):  Agilent Application Note   (Circuit / schematic design added 6/06)

Memory Address Multiplexing using 3.3V Bus Switch:  Pericom Semiconductor Application Brief # 022 (Electronic circuit design added 02/05)

Method provides automatic machine shutdown :  05/27/04 EDN Design Ideas  /  (added 1/05)  Some machines need to run for long periods and therefore may finish their work in the middle of the night or during the weekend. For the time remaining, until the operator returns, the machines stay idle, uselessly consuming power. This Design Idea allows a machine to completely shut itself down after finishing its work. 

Method to Reduce DC Power Consumption in CDMRF Power Amplifiers Through the LMV225 and an Efficient Switcher:  National Semiconductor - Application Note   (Circuit / schematic design added 6/06)

MF2 Compatible Keyboard with COP8 Microcontrollers:  National Semiconductor - Application Note   (added 2/06)

Microcontroller Multiplexes Dip Switches to I/O Port:  02/17/00 EDN-Design Ideas / (Circuit / schematic design added 6/06)  

 

MIDI Controller Footpedal:  (circuit / schematic added 6/05)

MIDI keyboard:  (circuit / schematic added 6/05)

MIDI Switcher:  (circuit / schematic added 6/05)

Mixed Voltage Memory Module using PI5C16861 Bus Switch as a Translator:  Pericom Semiconductor Application Brief # 008 (Electronic circuit design added 02/05)

MOSFET pair makes simple SPDT switch:  12/09/99 EDN Design Ideas /  (Circuit / schematic design added 6/06) 

MOSFET Replaces Switch #1:  01/20/94 EDN-Design Ideas / (Electronic Circuit diagram added 03/03)  By using a cheap, readily available MOSFET, you can use a single-pole switch to turn a bipolar power supply on and off without consuming extra power. In Fig1, the switch simply controls the MOSFET gate, which switches on the negative supply. Resistor R, which can be several megohms, is not necessary if the ±6V rails are permanently connected to a load, such as an op-amp circuit. Because the MOSFETs RDS (ON) is a fraction of an ohm, power loss is minimal, and the circuit suits moderate-consumption, battery-operated circuitry

MOSFET Replaces Switch #2:  02/03/94 EDN-Design Ideas / (Electronic Circuit diagram added 03/03) - You can use a single-pole switch to turn a bipolar power supply on and off without consuming extra power

MOSFET Switch provides efficient AC/DC conversion:  02/17/00 EDN-Design Ideas / (Electronic circuit added 10/03)

Multiple Remote Points Control on/Off Switch:  06/22/00 EDN-Design Ideas / (Electronic circuit added 5/02) / Sometimes, you need to remotely turn on or off a two-state system, such as a light, from multiple points. You could connect simple pushbutton switches in parallel to a single-line bus. However, if the bus simply controls a toggle flip-flop, the system must know its current state to positively ensure the new, desired state. For example, if you want to make sure the light is on, you must have visual or electrical feedback via a second line before deciding whether to toggle the flip-flop. Also, bounce-free pushbutton switches are necessary. The circuit in Figure 1 achieves positive state control according to the length of time you activate any pushbutton switch from S1 to SN. An activation of a few milliseconds, for example, guarantees that the system is set to one state. An activation of 1 sec, for example, guarantees that the system is set to the other state. No visual or electronic feedback is necessary....

Multiplexing LED Drive and 4x4 Keypad Sampling:  Microchip Application Note - Published 26-Aug-97   (added 2/06)

NanoMount Switches for Microwave Applications:  MicroNote 710 from Microsem  (Circuit / schematic design added 6/06)

Negative Voltage Load Switch :  The idea is simply to turn off the negative voltage load. Some examples:-- Bias votlages for LCD panels  - RF Amplifiers  - Audio Amplifiers. 
The good thing about this design is that i can make use of the system i/o voltage to control the on/off and this is the whole idea. However, there are many many type of load switches that turn of negative voltages.  (added 11/05)

Negative Voltage Load Switch:  The good thing about this design is that i can make use of the system i/o voltage to control the on/off and this is the whole idea. However, there are many many type of load switches that turn of negative voltages…. (added 3.06)

Optimizing Laptop Docking Station Designs using LAN Switches:  Pericom Semiconductor Application Brief # 041 (added 2/05)

Optical Toggle Switch using a Single Chip:  (circuit / schematic design added 6/06)

Switches#'s-B        C-G        H-L      M-O       P-S      T-Z



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