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diyAudio Member

Join Date: Oct 2006
Location: London, UK
Quote:
 Originally posted by YoungSC Thanks Pete, If I use the formula in the datasheet and apply it to the resistor values in the Super-Raygulators I get 1.25(1+1500/120) = 16.875 Vout This is where I'm getting confused becuase there should be 12Vout. However, if I use the resistor values in the first Raygulators then I get the following 1.25(1+1050/120) = 12.1875 Vout This is more like it. Now does that mean that R1 in the Super-Raygulators is incorrectly labelled 1.5k instead on 1.05k, or does the sum of my knowledge equal very little? If the formula above works for the Super-Raygulators, and I want to get 5 Vout, then my calculations show that I want a 3:1 ratio for R1:R2. Am I better off using the lowest resistors I can find, or just go for a pair such as 300 ohm and 100 ohm? Thanks again.
The Raygulator is the plain LM317/337 implementation as on the data sheet. The o/p voltage is the ratio of the divider resistors, +1, x 1.25V. So, say (1+ (360/120)) x 1.25 = 5V

The Super Raygulator, the resistor between o/p and adj pin has no bearing on the voltage. The voltage is the drop across the diodes + 1.25V (I believe - though not 100% sure). The other resistor is part of the gyrator.

Does this help?

 16th January 2007, 05:42 PM #5402 diyAudio Member     Join Date: Sep 2005 Location: DK Correct, the LM3xx will maintain 1.25v over the resistor placed between output and adjust. And with the zeners and the diode the adjust pin is 10v + 0.7v up, hence the output will be 10.7v + 1.25v = 11.95v. The 1k5 - 4u7 and the transistor is the gyrator,
 17th January 2007, 06:53 AM #5403 Magneto the Gravity Man diyAudio Member     Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!) DIYAUDIO.com Audiofest and Swapmeet - UK Slightly Off-Topic Pinkmouse is trying to start a UK DiyAudio.com meet etc in 2007. Somewhere in the Midlands. See :- http://www.diyaudio.com/forums/show...&threadid=94337 Andy __________________ If it ain't broke, break it !! Then fix it again. It's called DIY !
diyAudio Member

Join Date: Aug 2006
Quote:
 Originally posted by avr300 Correct, the LM3xx will maintain 1.25v over the resistor placed between output and adjust. And with the zeners and the diode the adjust pin is 10v + 0.7v up, hence the output will be 10.7v + 1.25v = 11.95v. The 1k5 - 4u7 and the transistor is the gyrator,
Alright, so for 5V I keep all the components the same except the Zener diodes. The LM317 will provide 1.25V, the 1N4148 will provide 0.7V, so I need to changethe 2 Zener diodes to 3V to get:

1.25 + 0.7 + 3 = 4.95V

Am I correct?

Sorry to labour the point, but I want to be sure, and I bet there are other people who will find this useful.

Thanks

diyAudio Member

Join Date: Oct 2006
Quote:
 Originally posted by YoungSC Sorry to labour the point, but I want to be sure, and I bet there are other people who will find this useful. Thanks
Keep hammering away cobber, I'm finding this very useful.

k.

diyAudio Member

Join Date: May 2003
Location: Sheffield, North England
Re: DIYAUDIO.com Audiofest and Swapmeet - UK

Quote:
 Originally posted by poynton See :- http://www.diyaudio.com/forums/show...&threadid=94337 Andy
That URL is borked mate, it aint doing nothing for me!

Simon

diyAudio Member

Join Date: Jan 2006
Location: London
Re: Re: DIYAUDIO.com Audiofest and Swapmeet - UK

Quote:
 Originally posted by SimontY That URL is borked mate, it aint doing nothing for me! Simon

ditto

diyAudio Member

Join Date: Jul 2003
Location: Bath, UK
Quote:
 so for 5V I keep all the components the same except the Zener diodes. The LM317 will provide 1.25V, the 1N4148 will provide 0.7V, so I need to changethe 2 Zener diodes to 3V to get: 1.25 + 0.7 + 3 = 4.95V Am I correct?
Spot-on! Or you could use an LED with a forward voltage of 3.0v, if you want visual indication of the thing working. Some blue/white LEds are in this range , IIRC.

Note that with the the exact voltage you'll get out depends on the current through the diode (zeners typically have 10-30ohms resistance at c.5mA) and to a lesser extent, temperature (they drift as they warm-up) - but don't worry about it.

Magneto the Gravity Man
diyAudio Member

Join Date: Mar 2005
Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)
Re: Re: DIYAUDIO.com Audiofest and Swapmeet - UK

Quote:
 Originally posted by SimontY That URL is borked mate, it aint doing nothing for me! Simon

OOOH!!!!

Anyone up for a UK diyAudio Meet?

This one works.

Andy

PS Simon.
Know any suitable venues UP NORTH ?
__________________
If it ain't broke, break it !! Then fix it again. It's called DIY !

diyAudio Member

Join Date: May 2003
Location: Sheffield, North England
Re: Re: Re: DIYAUDIO.com Audiofest and Swapmeet - UK

Quote:
 Originally posted by poynton OOOH!!!! Anyone up for a UK diyAudio Meet? This one works. Andy PS Simon. Know any suitable venues UP NORTH ?
That link does indeed work, thanks Andy.

I'm not sure what a suitable venue is to be honest, I've never done any kind of meetup, except meeting Brent and hearing his kit! I will post on that thread to keep the off-topic-ness away.

Simon