Search found 341 matches
- Mon Feb 28, 2005 9:56 am
- Forum: General Discussion
- Topic: Channel Phase Shift Measurements and Phase Equalizing Fi
- Replies: 4
- Views: 2214
Re: Channel Phase Shift Measurements and Phase Equalizing Fi
To do the analysis, you need a vector network analyzer (VNA). This applies a swept frequency to the input and plots amplitude and phase on the output. Phase equalization using allpass networks, in my experience anyway, is part science and part art. It would help if you could simulate the equalizer, ...
- Thu Feb 24, 2005 11:23 am
- Forum: General Discussion
- Topic: Yes , or No ?
- Replies: 9
- Views: 3828
Re: Yes , or No ?
I'm baffaloed by your question. How can two waveforms, 90 degrees out of phase, have a constant absolute value difference of 2 volts when they cross each other (diff=0) twice per cycle? Am I missing something?
- Thu Feb 17, 2005 1:42 pm
- Forum: General Discussion
- Topic: Prevention of Fine Soot Entering Room
- Replies: 15
- Views: 6546
Re: Prevention of Fine Soot Entering Room
Are you sure there is no leakage in the heat exchanger? I once had an open wood-burning fireplace that I added a forced-air tubular grating to. After a short time, the fire burned out some of the screws holding the tubing to the grate. The fan apparently sucked combustion products from the flame, wh...
- Wed Feb 16, 2005 11:45 am
- Forum: General Discussion
- Topic: impedance comverter
- Replies: 11
- Views: 5004
Re: impedance comverter
My guess is he's looking for a negative impedance converter.
- Tue Feb 08, 2005 3:01 pm
- Forum: General Discussion
- Topic: 78L05
- Replies: 8
- Views: 3685
Re: 78L05
<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>why is the period for 60Hz 7.5 ms in the handbook and 8.33ms in your example? <hr></blockquote> Well, the period IS 8.33ms, but, due to droop, the rectifier will start to conduct before the peak of ...
- Tue Feb 08, 2005 2:44 pm
- Forum: General Discussion
- Topic: 78L05
- Replies: 8
- Views: 3685
Re: 78L05
<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by philba: larger. Here's how I would do it.<p>Your 12V DC wall wart probably puts out around 17VDC peak (1.414 * 12). You want solid DC input of around 8V to the 78L05. So lets sa...
- Tue Feb 08, 2005 2:32 pm
- Forum: General Discussion
- Topic: Relay Driver Protection Diode
- Replies: 12
- Views: 5075
Re: Relay Driver Protection Diode
1N4148/1N914 is more than adequate for a 5V (or 12V), 40ma relay snubber. As Will says, the peak current will never exceed the steady-state relay current, since that current, which was flowing through the (transistor) switch, is simply diverted through the diode until the current decays. Take a look...
- Tue Feb 08, 2005 1:58 pm
- Forum: General Discussion
- Topic: Battery check
- Replies: 11
- Views: 4714
Re: Battery check
Do you want the entire circuit, including the LED, to be powered by the two AA batteries, or do you have a separate power source?
- Tue Feb 08, 2005 1:39 pm
- Forum: General Discussion
- Topic: Voltage Ladder
- Replies: 8
- Views: 3972
Re: Voltage Ladder
Do a Google search for "cockroft-walton".<p>[ February 08, 2005: Message edited by: RonH ]</p>
- Thu Jan 06, 2005 10:40 am
- Forum: General Discussion
- Topic: Voltage follower with variable offset?
- Replies: 13
- Views: 5782
Re: Voltage follower with variable offset?
You can also do it by classic op amp gain equations: <blockquote><font size="1" face="Verdana, Helvetica, sans-serif">code:</font><hr><pre> attenuator non-inv. gain inv. gain || || || Vout=Vin*R2/(R1*R2)*(R3+R4)/R3 - Vref*R4/R3 </pre><hr></blockquote><p>Where R1 and R2 are the in...
- Wed Jan 05, 2005 7:59 pm
- Forum: General Discussion
- Topic: guitar overdrive
- Replies: 8
- Views: 3865
Re: guitar overdrive
The transistors with caps in series with the bases won't work. Even if you get rid of the caps, it won't work. You need some resistors in that circuit. I don't know enough about the distortion you want, to make recommendations. Your gain control circuit also needs a resistor from U1A inverting input...
- Wed Jan 05, 2005 7:46 pm
- Forum: General Discussion
- Topic: Voltage follower with variable offset?
- Replies: 13
- Views: 5782
Re: Voltage follower with variable offset?
Your function is Vout=Vin-5. You can do this with an op amp, a 5 volt reference (the A/D's reference?), and two pairs of equal-valued, well-matched resistors. One pair forms a voltage divider of your temperature signal, with the center tap connecting to the non-inverting input. The other matched pai...
- Wed Jan 05, 2005 11:16 am
- Forum: General Discussion
- Topic: diode work at Hi-freq.
- Replies: 5
- Views: 2855
Re: diode work at Hi-freq.
<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by david753: indeed, there is a pair of diodes embeded in AD9057 in front of analog input. But, in the real situation, the output is not correct when the input signal is over volta...
- Wed Jan 05, 2005 6:58 am
- Forum: General Discussion
- Topic: diode work at Hi-freq.
- Replies: 5
- Views: 2855
Re: diode work at Hi-freq.
I doubt that the input diodes are designed to handle more than a few milliamps. See p.32 of this document from Analog Devices<p>[ January 05, 2005: Message edited by: RonH ]</p>
- Thu Dec 23, 2004 10:36 am
- Forum: General Discussion
- Topic: Electromagnetic physics question
- Replies: 41
- Views: 15085
Re: Electromagnetic physics question
Oops! Sorry for the double post.<p>[ December 23, 2004: Message edited by: RonH ]</p>