Search found 543 matches
- Fri Apr 16, 2004 6:57 pm
- Forum: General Discussion
- Topic: LED blinker into a LED ALT
- Replies: 9
- Views: 3643
Re: LED blinker into a LED ALT
If the alarm output can sink as well as source, you could connect the second LED in reverse of the first and connect it to the opposite polarity voltage. I assume the alarm output goes positive to light the first LED, which has it's cathode connected to ground. You would connect the second LED anode...
- Wed Apr 14, 2004 5:01 pm
- Forum: General Discussion
- Topic: Volt sensor with flashing LED
- Replies: 4
- Views: 2462
Re: Volt sensor with flashing LED
What is the low voltage point? If you send your schematic, I may be able to suggest a modification. [email protected]
- Mon Apr 12, 2004 8:09 pm
- Forum: General Discussion
- Topic: 1 Bit ALU
- Replies: 3
- Views: 2254
Re: 1 Bit ALU
Try a google search!
- Mon Apr 12, 2004 8:07 pm
- Forum: General Discussion
- Topic: Lighting a Bicolor LED
- Replies: 11
- Views: 4745
Re: Lighting a Bicolor LED
150 ohms should work.
- Tue Mar 30, 2004 8:32 pm
- Forum: General Discussion
- Topic: 433mhz data reciever
- Replies: 3
- Views: 2406
Re: 433mhz data reciever
The receiver is probably not tuned to the transmitter frequency. Try tuning the receiver for max signal.
- Tue Mar 30, 2004 8:25 pm
- Forum: General Discussion
- Topic: ICL7107CPL voltmeter configuration
- Replies: 4
- Views: 2996
Re: ICL7107CPL voltmeter configuration
The inputs have to be at least 1 volt above ground. If you are measuring the voltage, just move the sense resistor up the divider by 1 volt.
- Thu Mar 25, 2004 6:20 am
- Forum: General Discussion
- Topic: Diode matrix array chip...
- Replies: 2
- Views: 1910
Re: Diode matrix array chip...
Why not use a PGA (progammable gate array)?
- Mon Mar 22, 2004 4:22 pm
- Forum: General Discussion
- Topic: Instrumentation??? amplifier
- Replies: 12
- Views: 4654
Re: Instrumentation??? amplifier
You may be thinking of "chopper stabilized op amp". The LTC1050 is an example.
- Fri Mar 12, 2004 8:13 pm
- Forum: General Discussion
- Topic: Need to hire someone to build sound/audio to light modul
- Replies: 1
- Views: 1690
Re: Need to hire someone to build sound/audio to light modul
Which approach is least expensive depends on how many you will produce. A digital signal processor would have the lowest component cost but the development cost would be higher than an analog approach. I am not willing to pay for a long distance phone call, how about an email address?
- Sat Mar 06, 2004 7:17 am
- Forum: General Discussion
- Topic: Component sources
- Replies: 11
- Views: 5741
Re: Component sources
I buy from Mouser because they have a broad line, no minimum order and prices are good. You can sometimes find bargains at Jameco or All Electronics, but the selection is limited.
- Fri Mar 05, 2004 8:20 pm
- Forum: General Discussion
- Topic: Gameshow Buzzer questions
- Replies: 3
- Views: 2327
Re: Gameshow Buzzer questions
Answers to your questions:
1. yes
2. no, 2n54-- is rated at 800 mA, lamp draws 1 amp. Use Teccor #TCR22-4.
3. Use two lamps in series to operate on 12 volts.
4. Yes, buzzer works from 3 V to 15 V.
1. yes
2. no, 2n54-- is rated at 800 mA, lamp draws 1 amp. Use Teccor #TCR22-4.
3. Use two lamps in series to operate on 12 volts.
4. Yes, buzzer works from 3 V to 15 V.
- Sun Feb 29, 2004 5:43 pm
- Forum: General Discussion
- Topic: need small AC motor speed control circuit
- Replies: 6
- Views: 3196
Re: need small AC motor speed control circuit
most AC motors are synchrounous with the AC frequency and cannot be speed controlled, except by changing the frequency. Why not use a DC fan?
- Sat Feb 28, 2004 6:47 pm
- Forum: General Discussion
- Topic: i am having a "file not found" day
- Replies: 4
- Views: 2340
Re: i am having a "file not found" day
The circuit is at: http://www.geocities.com/russlk/limitckt.jpg
You will have to copy and paste the URL in the address bar, geocities does not allow links.
You will have to copy and paste the URL in the address bar, geocities does not allow links.
- Fri Feb 27, 2004 6:59 pm
- Forum: General Discussion
- Topic: i am having a "file not found" day
- Replies: 4
- Views: 2340
Re: i am having a "file not found" day
You only need one DPDT relay, configured to run the motor one way when energized, the other way when de-energized. Place the limit switch in series with one of the relay contacts to stop the motor. The other limit switch is in series with the other set of contacts. The motor will run when the relay ...
- Sun Feb 22, 2004 6:21 pm
- Forum: General Discussion
- Topic: New to hobby
- Replies: 11
- Views: 4710
Re: New to hobby
Well, you could subscribe to Nuts & Volts. The local library is always a good source, and Radio Shack usually has some basic books.