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A friend of ours bought a garage door sensor that has two LEDs and a beeper that goes off when the door is first opened. An electrician installed it in about 2 hours so he doesn't know too ...
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Hello, anybody has the datasheets for the following two parts: T25089 and MK50981N both of them should be TELEPHONE DTMF DIALER,16-PIN DIP Thank y...
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| Driving two transistors with same signal |
Hi, I have two common anode 7-segments displays, and only one wire to drive them. I need to achieve the following : when the control signal is +5V, display1 is ON and display2 i...
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| DTMF from a pic chip |
Hello, I finally got my circuit working... well almost. I use a pic chip with picbasic pro, I output DTMF and this goes through a filter shown in picbasic manual: http://www...
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| cc at powersupply |
we r doing one project based on uc.we want 2 supply voltages one is 5v,and another is 3.3v.we r using adjustable voltage regulator to adjust the o/p voltage.i will consume 50mA,but we slowl...
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I purchased an armband radio recently, for jogging. Truetech, if that means anything. I inserted 2 new alkaline AAA batteries, they are now dead after about 90 minutes use. I...
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I'm confused about the use of terminators. I'm sending pulse signals from some 93 ohm output equipment through 93 ohm coax to my scope which is 50 ohm. I have a t at the scope. Should I be p...
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| Changing Breaker Box - Looking for Different Perspective |
My question came up when a friend of mine asked if I could change out his Federal Pacific breaker box to a newer, safer one. My background is in industrial controls and I don't normally dea...
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| does Cyrus amp need a load? |
Hey all; My brother has a Cyrus amp that he would like to use a wireless headphone set with. Trouble is, there's no headphone jack, so I was going to rig something up where he cou...
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We just switched over to DSL from modem on home computers. Put DSL filters on the handsets in the house and also on the cord going to the computer modems. When we try to receive faxes on...
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| Help needed to construct wireless headphones |
Hi everybody, It has been a long time since my college and I wish to brush up my learning that I once did. I am in need of a wireless headphone and would love to construct one of my own...
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| OpAmp and reference recomendations |
I got tired of looking for a FET LDO that meets my line and load specs, so I'm building my own. The LP38691 is the closest I could find thats in stock and doesnt cost a lot,and with th...
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| pulsing leds |
Is there a upper limit as to how fast you can pulse an led say a ordinary red led 2v v forward,20mA current. I'm try to drive it with a signal generator,and pick up the flashes with a sensor...
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| Reducing EMF on cooling fans |
I am tasked with reducing "EMF" in the vicinity of computer type brushless 12VDC cooling fans. Problem similar to http://www.sciencedaily.com/releases/2008/04/080430201654.htm ...
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I want to built a garage for an electric vehicle with a photovoltaic roof and/or a wind generator that will trickle charge the battery. I need a simple, economical DC system with the reliab...
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| Substituting a digital pot for a mechanical pot in an AC voltage |
Hello, I have a question. I have been trying using a DS1867 digital potentiometer in a circuit that will replace a mechanical potentiometer of 250KOhm. The circuit/device that is ...
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Hi, I am interested in pre solid state electronics and would like to learn to design circuits and build my own guitar amplifiers. Every book I've seen so far deals with all sort...
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| 12 Volt Regulated Supply |
I was looking at a 12 volt regulated power supply at Dick Smith Electronics cat. number M9935 @ www.dse.com.au for a regen radio I'm planning on building (http://www.schmarder.com/radios/tub...
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| Magnetic Earphones - Series Or Parallel? |
I am thinking of building a set of earphones for my regen radio, as an alternative to my extremely uncomfortable antique magnetic earphones. I found some cheap earphones at Antique Electroni...
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| transistor base input |
Hi all I have an old analog alarm system. I am hooking up the bell output to a microcontroller. Although the output voltage for the bell fluctuates around 6 to 9 volts. I nee...
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| Quarternary Logic |
Hey guys, I was thinking of a new concept whereby we could square the amount of information stored in a bit. Currently, the information stored in a bit is whether the bi...
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