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43202

Re: CDV-700 headphone fixes and hacks

That is why it's important to keep track of your wiring! My concern is if it was hooked up backwards you would destroy your sound card if you used this for
Tom
6:23 PM
#43202
 
43201

Re: CDV-700 headphone fixes and hacks

You are correct about the 1k ohm. I measured the dc impedance with a good multimeter and that's exactly what it is. Running pulses might change the impedance,
David Nix
6:12 PM
#43201
 
43200

Re: CDV-700 headphone fixes and hacks

Piezo clickers ARE high impedance, so no problems. Leds are not, but as the voltage is low, probably the series resistor keeps the current within reason. On
M K
5:59 PM
#43200
 
43199

Re: CDV-700 headphone fixes and hacks

Interesting that you say 800 ohms....I've seen stuff claiming that the cdv-700 headsets were 4000 ohms(I'm not saying that I believe it)-I suspect 1000 ohms is
M K
5:57 PM
#43199
 
43198

Re: CDV-700 headphone fixes and hacks

Yep! The top three are the real deal! The bottom two are 600 Ohm 1:1 transformers. They are worth having for isolating DC from audio or small signal projects.
Tom
5:18 PM
#43198
 
43197

Re: CDV-700 headphone fixes and hacks

http://www.ebay.com/itm/Five-Radio-Shack-audio-transformers-/201357462470 Some of those here, NOS.
David Nix
5:11 PM
#43197
 
43196

Re: CDV-700 headphone fixes and hacks

http://hpschapters.org/northcarolina/CDV.pdf No mention was made about minimum impedance. My cheap headphones are 32 ohm and only produce an audible click in
David Nix
5:08 PM
#43196
 
43195

Re: CDV-700 headphone fixes and hacks

CDV-700 headsets are all high impedance! I did research many years ago that showed that the impedance was right at about 800 Ohms. Research on audio power
Tom
4:58 PM
#43195
 
43194

Re: CDV-700 headphone fixes and hacks

just keep in mind that at least some cdv-700's should not be used with a low impedance headset. I'm not sure which versions have this issue, but if I
M K
4:34 PM
#43194
 
43193

CDV-700 headphone fixes and hacks

http://www.instructables.com/id/CDV-700-headphone-repair-and-adapters/ I found two adapters on eBay for cheap that allow a direct connection with the existing
David Nix
4:09 PM
#43193
 
43192

Re: SBM-20 array that works on a CDV-700

Very nice "instructable". I like how easy it is to remove tubes from the circuit. That would make it easy to check to see how linear the response is to the
m1i8k3e6
May 24
#43192
 
43191

Re: SBM-20 array that works on a CDV-700

Very very good. That's basically what Detectron did with the DR 390, and its 24 ea. 6306 Bizmuth tubes, back in the 50s. They were used for Aerial
Robert Druecker
May 24
#43191
 
43190

SBM-20 array that works on a CDV-700

http://www.instructables.com/id/Homemade-SBM-20-gamma-detector-array/ All the parts listed. Since Radio Shack is going away, I used eBay and Home Depot for
David Nix
May 23
#43190
 
43189

Radio Shack CDV-700 parts deals

Radio Shack's going out of business discounts have gone to 50% lately. I got packs of 4.7k ohm resistors for 50 cents and their 9v battery powered speakers
David Nix
May 19
#43189
 
43188

Re: It's obvious. Real Vic 6993 tubes are wired differently [1 Attac

Dunno if it helps but I'm looking at the pins on three different tubes and one of them is a Vic with the yellow wrap still on it. The other is an EON. The
C. R.
May 11
#43188
 
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