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Old 30th November 2009, 02:09 PM   #591
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Ooooh, nice. Well tell you what, let me have a look in my cables box first. I have this huge box, it looks like a bag of snakes with all sorts of wire in there!! I know theres an oddball cable in there with 7 coax leads terminated with BNC connectors. If they are coax, I'll at least try those first - hopefully I get to try that tonight.

My transformers are stuck in customs, even though they come from within the EU ho-hum.

Fran
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Old 30th November 2009, 02:37 PM   #592
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Default fuse holders

What are people using using for fuse holders? Can I get a fuse holder that will hold 2 of them?

It would have been nice if the fuse holders were mounted on the pc board.
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Old 30th November 2009, 05:46 PM   #593
Salas is offline Salas  Greece
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Quote:
Originally Posted by woodturner-fran View Post
Salas: I think I have some small section coax, so I will certainly try that. So, just use the centre conductor for signal and the shield for ground, or use 3 runs (for signal L, R and GND) and then tie all 3 shields to GND?

Fran
Centre for signal L, shield to ground, then another one for R, shield to ground again. Its a simple experiment for just one input. You can do fast A/B with another input.
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Old 30th November 2009, 09:41 PM   #594
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Cant get my copy of this project finished...Bought 100 yellow leds from THE LEDSHOPPE (China) waited 2.5 weeks for their arrival. The description claimed 1.8 volts FV typical...Turns out ALL 100 leds were within 2% or better of 1.95volts. Will send to Mouser for new batch. DIY is not always easy!!!
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Old 30th November 2009, 09:44 PM   #595
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Originally Posted by sandyhooker View Post
Cant get my copy of this project finished...Bought 100 yellow leds from THE LEDSHOPPE (China) waited 2.5 weeks for their arrival. The description claimed 1.8 volts FV typical...Turns out ALL 100 leds were within 2% or better of 1.95volts. Will send to Mouser for new batch. DIY is not always easy!!!
Mistake was buying them from china
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Old 30th November 2009, 09:45 PM   #596
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I got a batch of 64 from mouser... I've tested a half dozen and there ~ 1.95 volts too.

I got a 9v transistor battery, and 1k & led in series. (Isn't that right, for led matching?)
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Old 30th November 2009, 10:19 PM   #597
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you can always get the 5 dollar grab bag of LED from RATSHACK. can mix and match.
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Old 30th November 2009, 10:31 PM   #598
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Its a good rig the one you used so to check Vf at enough mA, as they will work on the real boards.

Just use 4 of them 1.95V and in a Led position put 2 little diodes (1N4004) in series instead then. 1.95X4=7.8+DiodeDropX2+Vbe=about 10V. Those diodes are checked once by a member and measured very low noise.
Just tie the 2 diodes on air and insert them as a single component in one of the led positions. There are solutions so not to wait and wait.
See the picture, and don't forget, in the negative reg cathodes are facing the other way around.
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Old 1st December 2009, 01:27 AM   #599
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Thanks for the good advice. The thread seemed so specific I feared that any rigged solution would taint the project philosophically. It's hell being a purist.
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Old 1st December 2009, 01:33 AM   #600
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