| Jeopardy Circuit Question |
I have a question about a Jeopardy Circuit I found on the internet and decided to build. To start, here is the link to the circuit so you understand what I am talking about: http:...
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| what is it ? |
Hi all, does anybody give me some information on Siemens CT 96 HAND 963S ? What is it ? Where can i find the datasheet ? thanks mauri
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| Unity gain buffer amplifier to lower impedance |
Greetings! I have a medium frequency analog signal coming from a DAC (AD557), but the DAC's output impedance is too high for my purpose. So I am trying to design a medi...
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| Some PIC projects ... |
Hi, FYI, I've put 2 of my PIC projects (chronograph and rechargeable lantern) on a webpage at: http://www.geocities.com/pest3125 Hopefully, I can add more projects later. Note that...
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| OT: On this day, 45 years ago |
Hmmmmm! Here it is Thursday, March 31, 2005 On another Thursday, March 31, 1960 I married my high school sweetheart Today we celebrate our 45th Wedding Anni...
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| Nichia UV LEDs on eBay 375nm and 10Amp ultra miniture Relays |
LED http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=7504608911&ssPageName=STRK:MESE:IT Relay http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=7504609961&ssPageN...
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| Novice hobbyist looking for help |
Hi, I'm working on a project and need help. I have a small room that I need to setup a couple of devices. This is for an art show im doing, and its suppose to mimic an interrogati...
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| Where is Spehro? |
Ok, I need my Spehro fix. Where is Sephro, he has not responded in weeks. Out drinking with DNA, maybe but DNA is up and about. Hope one of you guys haven't pissed him off. Please ad...
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| Transistors Checking Troubleshooting - BJTs, FETs |
How do I check if a transistor is working using a multimeter - both BJTs and FETs? How will I know if it's shorted etc? Also, for a BJT how will I know the emitter, base and collector by u...
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| SMD techniques |
Hi, can anyone help please? I have to migrate a number of designs from PTH to Surface mount. Can anyone suggest a concise book or on-line resource that can answer questions such a...
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| Is this ~150W 12V dc-dc supply realistic? |
A guy on mp3car.com is offering up a very compact 12V supply and I am wondering if the claims he is making are legit. I had contemplated a similar supply myself but my knowledge was limited...
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| PCB antenna design guide |
Hi all, I'm seeking for a design guide to implement PCB RF antenna (ISM band 2.4Ghz) or may be a software too. Many thanks for all, Habib. betula.fr
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| hp4275A manual in pdf or hardcopy |
hi does anyone have a copy of hp4275A manual in pdf or hardcopy I could aquire for a small sum? WAYNE
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| Connecting to the real world |
Hi, I have a PCB with 0.1 inch dual row headers, inside a sealed metal box. I need to connect the Real World to it. We usually avoid using external connectors, but in this case we...
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| Transmitter output |
Hi all, I have a small question. I want to make a simple tone (10MHz)transmitter cct from a 1Vp-p 10MHz input signal. I can drive a transistor(NPN) from this signal. But my questi...
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| Spice simulation far from actual circuit behaviour |
I am trying to use the TLV2241 DIP package IC to make a relaxation oscillator(square wave oscillator using positive feedback). I first simulated the design in spice (both ORCAD PSPICE and WI...
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| Help me solve this design problem PLEEEZ |
There is an electromagnet at my job that has a 50% duty cycle. That is it may be on for up to 5 minutes and then off for 5 before using it again. I want to design a circuit that acts as a ...
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| difference between spice simulation and actual circuit |
I am trying to use the TLV2241 DIP package IC to make a relaxation oscillator(square wave oscillator using positive feedback). I first simulated the design in spice (both ORCAD PSPICE and WI...
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| How to wire a Reed Relay |
Hi, Sorry for the basic question, but I'm looking for some help on how to wire the following Reed Relay (v23100-v4005-a011): http://relays.tycoelectronics.com/datasheets/ree...
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| Problem with Spice - it won't allow me to change bounds of graph |
Hi - I'm trying to simulate a circuit with spice (which I'm very new to). I first set a DC sweep on the input (V3): https://netfiles.uiuc.edu/mnoone/www/Electronics/iviewcapture_date_...
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| dc or ac |
Hello All, I have been studying electronics for some time but my understanding on ac and dc analysis is still not too clear. I wish you all can put some time to explain a li...
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| John Larkin's fast 50V pulse with a 2n7000. |
John Larkin wrote... See John's fast rise/fall-time 50V pulse with a 2n7000, on a.b.s.e. That's pretty good, 1.9ns rise and 2.5ns fall, how'd you do that? Hmm, how short ...
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| Attenuation of op-amp gain |
A design I'm doing uses and ADC with a 2.5 volt reference. The ADC if buffered with a voltage follower. The problem is that some of the signals are >2.5 volts, and have an Rout of
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| an IC we need |
Somebody should make a family of DACs that output capacitance instead of voltage or current. All sorts of neat stuff would then be possible. This is a good first start... ht...
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| vlf transmitter, part II |
This morning, I put my 17 Khz vlf transmitter (petsafe wireless fence) on spectrum lab running on my laptop. What I saw has put me in a tailspin. I have the schematic and the scre...
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| Indoor tabletop motion detector??? |
Does anyone sell an inexpensive indoor tabletop motion detector that controls a lamp?
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| How to connect wall power to PCB? |
Hi - a board I'm making is switching a 120VAC line. I'm trying to figure out how to connect the 120VAC input and output lines to the PCB. Normal house wire (solid, 14 awg I think, but I co...
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| What's this Connector? |
I posted some photos on alt.binaries.schematics.electronic. There are two of them on a '79 Porsche 928 Central Warning Computer. My CWC is starting to get a little flakey. It mon...
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| Peltier modules - Different voltages in parallel? |
I'm a computer scientist and know very little about electronics. After a while of google searching, I haven't been able to find a solution to my problem. I'm building a simple DC ...
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| FA: PC844 optocouplers and lot of 2,000 + 74xx ICs |
Figured I'd mention these two lots I just posted, may be a good cheap source of parts for folks... Lot of 37 Sharp PC844 Optocouplers: (BIN $15) http://cgi.ebay.com/ws/eBay...
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