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Touch Switch Using Cd4066B Circuit – Circuit Schematic
Touch Switch Using Cd4066B Circuit
When touch switch SI is activated, R4 is driven high, and the control voltage goes high, which latches the switch....
Touch On Switch Circuit – Circuit Schematic
Touch On Switch Circuit
This touch on-only switch can be triggered into conduction by electrical means, and can only be reset by way of a mechanical switch....
Touch Switch Circuit – Circuit Schematic
Touch Switch Circuit
When the touch-on contacts are bridged, pin 6 of Ul-b goes low, which forces its output (the set output) at pin 4 to go high. That high divides along two paths...
Hexfet Switch Circuit – Circuit Schematic
Hexfet Switch Circuit
The hexFET can swatch dc power to relays (as shown in A), motors, lamps, and numerous other-devices. That arrangement can even be used to switch resistors in a...
Electronic Safety Switch Circuit – Circuit Schematic
Electronic Safety Switch Circuit
SI and S2 must be depressed within 200 ms of each other to activate Kl. The hold Lime is adjustable via K7....
Solid State Relay circuits – Circuit Schematic
Solid State Relay circuits
This dark-activated relay switch can be used to turn on walkway or other outdoor lighting at dusk. By using alternate connections to A and B, increasing illumi...
Solid State Relay Circuit Circuit – Circuit Schematic
Solid State Relay Circuit Circuit
Rl limits input current while Ql acts as a current sink to protect IC1. D1 serves as a polarity protector....
Solid State Latching Relay Circuit – Circuit Schematic
Solid State Latching Relay Circuit
This simple circuit provides a solid-state equivalent of the electromechanical latching relay (see the figure). What`s more, the switching is clean, highly res...
Dc Output Chopper Circuit – Circuit Schematic
Dc Output Chopper Circuit
Any dc voltage source in the 2- to 15-V range can be chopped into a unipolar square wave that has a peak amplitude nearly equal to the dc source voltage-with c...
Self-Latching Light-Activated Switch Circuit – Circuit Schematic
Self-Latching Light-Activated Switch Circuit
When light strikes the CDS cell it turns on the transistors which activates the relay which latches. Depressing SI grounds the base of the 2N3565 and the relay...
Sensitive Triac Controller Circuit – Circuit Schematic
Sensitive Triac Controller Circuit
The single transistor connected between the capacitor and the common side of the ac line allows a logic-level signal to control this triac power circuit....
Simple Triac Circuit Circuit – Circuit Schematic
Simple Triac Circuit Circuit
A triac can be used as a line-operated ac power switch that can directly control lamps, heaters, or motors. A brief and small current pulse into the gate turns...
Touch Switch I – Circuit Schematic
Touch Switch I
This switch reacts to the touch of a finger to turn lights and/or appliances on or off. The device uses the human body as an...
Switching Circuit – Circuit Schematic
Switching Circuit
This switching circuit acts like a bank of interlocked mechanical switches; pushing one of the buttons latches its corres...
Optoisolator – Circuit Schematic
Optoisolator
The circuit protects a solid-state relay from overloads. The circuit limits current, automatically disconnects the load after ...
Solid-State Relay – Circuit Schematic
Solid-State Relay
A power MOSFET and a quad exclusive-OR oscillator makes an effective solid-state relay. Figure 75-5(a)"s capacitively iso...
Low-Consumption Monostable Relay – Circuit Schematic
Low-Consumption Monostable Relay
A monostable relay has two states: operative when a large enough current flows through its coil and quiesc...
Latching Ac Solid-State Relay – Circuit Schematic
Latching Ac Solid-State Relay
Latching is obtained by storing the gate trigger energy from the preceding half cycle in the capacitors. Powe...
Bang-Bang Controllers – Circuit Schematic
Bang-Bang Controllers
Just one chip, the PWR-DRV1 from Power Integrations, builds a "bang-bang" controller that switches 275 mA and runs of...
Pushbutton-Controlled Power Switch – Circuit Schematic
Pushbutton-Controlled Power Switch
In both circuits, the SCR (and thereby the lamp) can be latched on by momentarily closing SI, thereby fe...