CheapnDisgusting:
I downloaded this file 6 mos. ago. At first it gave me fits on several hangups. Once I got by these, I came to love it. Have made up many custom components of my own and added them to library. I've tried others, but keep coming back to this one for ease and simplicity.
Search found 2220 matches
- Wed May 18, 2005 8:54 pm
- Forum: General Discussion
- Topic: Really neat sch/pcb layout program
- Replies: 9
- Views: 4243
- Wed May 18, 2005 4:26 pm
- Forum: General Discussion
- Topic: Sound Power
- Replies: 25
- Views: 10660
Re: Sound Power
jwax: Correct - every doubling of power will get you 3DB's. I had considered a flock of cheap piezos, but was warned of possible acoustic cancellations, Not familiar enough with this subject to make any intelligent decisions. It's like Rossana Anna Danna says-Its always something. Have checked out r...
- Tue May 17, 2005 8:53 pm
- Forum: General Discussion
- Topic: WATT-HOUR METER Table Lamp
- Replies: 7
- Views: 3626
Re: WATT-HOUR METER Table Lamp
I salvaged ,built and own one of these lamps. I believe the meter is circa 1960 which I aquired in the 90's when I worked radio comm.& microwave relay for the local power company. Mine spins at approx. 20 rpm and this seems like a good speed also light years ahead of what a 60 watt load would no...
- Tue May 17, 2005 9:09 am
- Forum: General Discussion
- Topic: Sound Power
- Replies: 25
- Views: 10660
Re: Sound Power
jwax: Thanks again for another informative web site. ezpcb: There are a number of ways to driive the end device (tweeter?),which are not to difficult to construct. However my big hangup so far has been the end device. Getting a lot of mixed signals on piezo information.The most credible device (sugg...
- Mon May 16, 2005 8:23 pm
- Forum: General Discussion
- Topic: Add DC bias to sinusoidal signal
- Replies: 13
- Views: 7976
Re: Add DC bias to sinusoidal signal
Not sure what the battery is for. Cannot see detail on sine graph to make it out. So I'll take a wild shot at it any way. Could you bias the circuit like most single supplied op amps,that is resistively split the supply and return both inputs to that point. They would be capacitively coupled of cour...
- Sun May 15, 2005 8:55 pm
- Forum: General Discussion
- Topic: Sound Power
- Replies: 25
- Views: 10660
Re: Sound Power
Thank you Jwax for your web site-will check it out. Have been trying to get detailed info on tweeter power ratings and I guess I'll try the manufacturers. Hopefully end up with their engineering Dept. I calculate that at 150' distance I would need 125 DB at the source to end up with 90 DB at stated ...
- Sat May 14, 2005 10:11 pm
- Forum: General Discussion
- Topic: Terri's Law
- Replies: 3
- Views: 2263
Re: Terri's Law
Sea clams can weigh up to 500 pounds
- Fri May 13, 2005 5:30 pm
- Forum: General Discussion
- Topic: Capacitance measurement needed
- Replies: 4
- Views: 2446
Re: Capacitance measurement needed
Not enough info!! What is your DEVICE And What are you trying to CONTROL.
- Fri May 13, 2005 12:00 pm
- Forum: General Discussion
- Topic: High frequency to voltage converter
- Replies: 10
- Views: 4651
Re: High frequency to voltage converter
One diode , one resitor, one capacitor. Arrange as an RF detector used in test equipment probes. Feed a Transistor Ampl, with this and pick off the DC you desire. Cant give exact values without knowing more parameters, but for starters a 1N914 seriesed into a1000 PF to ground then feed transistor ba...
- Fri May 13, 2005 11:44 am
- Forum: General Discussion
- Topic: Sound Power
- Replies: 25
- Views: 10660
Re: Sound Power
Thanks all for replys. As to the 120 Watt Amp and two piezos , what was the rms voltage output? My problem has been a high enough driving voltage to get max power into these tweeters (example--75 watt tweeter & 120 ohm Z, would require 95 volts rms according to ohms law E sq./120) Or are the man...
- Thu May 12, 2005 9:06 pm
- Forum: General Discussion
- Topic: Sound Power
- Replies: 25
- Views: 10660
Sound Power
I need a high power , high frequency sound source. 15 to 20 Khz & 120 db,150 db? My original attempt was a 50 Watt amp (@8 0hm) Driving a pair of Piezo horn tweeters. Coulnb't get the sound power needed as I later discovered these have an impedance of approx. 120 ohms.Now I am thinking of switch...
- Tue May 10, 2005 5:32 pm
- Forum: General Discussion
- Topic: Driving a relay from a 3V AC signal
- Replies: 8
- Views: 4295
Re: Driving a relay from a 3V AC signal
OOPS--May have made too many assumptions, When you say 3VAC--are you referring to 60 Hz line or other. If you are driving an opto device prior to the relay coil. what is input Z. If hi enough, the before mentioned circuit driving CD4528/38 (retrig. one shot) with period 20 milliseconds would do the ...
- Tue May 10, 2005 4:42 pm
- Forum: General Discussion
- Topic: Driving a relay from a 3V AC signal
- Replies: 8
- Views: 4295
Re: Driving a relay from a 3V AC signal
3VAC--RMS? This would be 4.3 Volts Peak .Just clamp the negative portion to ground with a diode thru 10K resistor. This will be enough to drive 5V CMOS logic. Assuming that your 3VAC is from lo freq. source.
- Thu Mar 31, 2005 9:09 pm
- Forum: General Discussion
- Topic: Can nomeone explain this to me: current(AC vs DC)
- Replies: 21
- Views: 9322
Re: Can nomeone explain this to me: current(AC vs DC)
The lamp setup like you descibe, many times use switching supplies that actually out put hi-freqency AC (5-10 Khz).This would give screwy readings in either AC or DC on your lo-frquency meter.
- Wed Mar 30, 2005 8:31 pm
- Forum: General Discussion
- Topic: missing parts list Nuts/Volts April
- Replies: 2
- Views: 1837
Re: missing parts list Nuts/Volts April
Editors mistakenly omitted the parts list.Also they left out Fig. #2 which shows board layout. Should be posted on their website as of now.