Simple Touch Light Switch Circuit
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Testing fuses To see if a fuse is still working, touch the probe of the tester to the metal threads of the fuse and the alligator clip to the contact at the base of the fuse. If the fuse is good, the light in the tester's handle will glow. To test a cartridge fuse, simply touch the probe to one end and the clip to the other. If the fuse completes the circuit and lights the bulb, it's good. Testing lamp switches To test a lamp switch, unplug the 4f\ti. Simple. Touch. Pad. Dimmer. I V W B. Kainka 63V radial Inductors: L1 =200/vH 1A Semiconductors: D1 = Schottky diode type PBYR745 or equivalent D2D5 = zener diode 10V, 0.4W D6D15 = whiteLED IC1 = LM2585TADJ (National.Semiconductor) I 'siiij. a PowerFET it is possible to build a very simple touch dimmer for low voltage lamps. If you do this, don't forget to first switch off the associated branch circuit in the fuse box, since the mains voltage is always dangerous!Construct a simple electromagnet and use it to create a working solenoid switch. Wire and test a galvanometer using a coil, a compass, two resistors, and a power supply. Build and test a simple electric motor. Build and test a circuit featuring “flashing lights” using LEDs, resistors, capacitors, and transistors. Take measurements at various points in the circuit to confirm the existence of alternating current and oscillation. Build and test a “transistor LED driver” (a.simple touch switch) using This eliminates complicated switching circuits and gives you truly adequate light control. In a lowvoltage system, the lights in the various rooms are switched on and off by relays in a metal box up in the attic. The relays are activated by lowvoltage current and pushbutton switches on the walls — it's as simple as a doorbell circuit. You run 115volt wiring only to the light fixtures themselves. You string inexpensive doorbell wiring across the walls to the touchplate switches, running it Here is a circuit that helps you choose between two stereo sources by simple touch of your hand. This circuit is so compact that it can be fixed within the outputs being connected to the power amplifier input,.which is indicated by lighting of LED 1. When touchplate S2 is touched, the outputs of gates Nl When pin 9 is pulled 'low', all the switches within the multiplexer change over to the alternate position to select tape player as source. EFY Lab note. Although one can connect pin 7 (continued) IJl^ — Project 37: TouchSwitch Counter A touchswitch is a handy input circuit. It is activated by a light touch of a fingertip across a pair of metallic plates. It is no problem to electronically keep track of the number of times the contacts are touched. All we have to do is count the A block diagram for a simple touchswitch counter circuit is shown in Fig. 724. As you can see, there is nothing complex about this project. There is.one important consideration you must keep in TouchControl Circuits The sources of the following circuits are contained in the Sources section, which begins on page 1043. The figure number in the box of each circuit correlates to the entry in the Sources section. Touch Switch I Touch Sensor Touch Switch II LightOperated Turnoff Touch Switch SwitchOperated Turnoff Touch Switch Alternative LightOperated Turnoff Touch Switch Simple Touch Switch Touch Switch III TOUCH SWITCH I POPULAR ELECTRONICS Fig. 1111 This A voltage tester is a simple, inexpensive device that tells you if there is electricity in a cable, outlet, or switch. A voltage tester has no power of its own, but merely conducts voltage from one wire to another. As current.passes through the wires, it lights a small neon bulb, which signals the presence of a current. Because a voltage tester can keep you from inadvertently touching a hot wire, you should buy one before you begin any wiring project. Voltage testers are also useful in testing The electrician installed low voltage wiring for the light switches. Now some of the lights don't work, and my neighbor can't seem to get them fixed. Why was this system used rather than 110volt wiring? Low voltage light switches were installed so that the lights could be controlled from three or more locations. With this svstem, it is also possible to control all the lights in the house from a master panel. The circuit for this type of svstem includes.a transformer and an electricallv operated For reading ina livingroom a more relaxed light level is required, with brightertask lighting around the person who is reading. Individual dimmer switches are very useful within a living room, and having a dimmer switch forevery circuit allows the precise tailoring of light within the space. This is much better thana simple on/off control. Individual dimmers will work up to about four lighting circuits. While dimmer switches are available with five or more switches on them, they are large and