duel power supply design help

MrDEB · 19th November 2010, 03:38 PM

In need of a duel supply to power several TL074's at +12/0/-12
then need to power a cd4066 bi lateral switch as well as 10 lm3916's with led displays so 2-3 amps at 9v needed.
have schematic but it just dosn't look right?
Thinking of powering the cd4066 from the duel 12v supply but ??
18v transformer may be too much or ??

MrDEB · 19th November 2010, 08:43 PM

the R2 & R4 are supposed to be 1200ohm

AndrewT · 20th November 2010, 11:53 AM

compare your hi current 9V supply to what is shown on the regulator datasheet.

abraxalito · 20th November 2010, 12:00 PM

Schematic in post #2 has several serious errors that I can see. 2N3055 is NPN, the LM337 is backwards. Neither LM3X7 has the correct wiring to the ADJ pin, R3 and R4 are potentially transposed.

MrDEB · 20th November 2010, 06:06 PM

I corrected errors etc.
The R1 and R4 are supposed to be 120ohm while R2 and R3 (I need to correct) are 600ohm
labeled Q1 correctly
Took out several caps
hope this is all correct

MJL21193 · 20th November 2010, 08:22 PM

Howdy!
The LM317 has the wrong pin out on you scheme - Pins: 1-in, 2-adj, 3-out.
The LM337 has the wrong pin out on you scheme - Pins: 1-adj, 2-in, 3-out.
The LM337 is still backwards.
You are shorting the adjust pins of both regulators to ground.
C11 and C12 are not needed if the LM7809 is within 4 inches of the main filter caps.

MrDEB · 21st November 2010, 03:40 AM

hopefully corrected all my errors.
The 7.5+v side has more current draw than the 7.5-v side thus a smaller cap.
This should work if I am lucky
been working mostly off over the last 2 years on this Eq/ Spectrum analyzer
4 stereo inputs
5 bands per channel
10 lm3916 display drivers w/10 leds per
the bandpass filters are using a TILT filter design.
Been cleaning up schematics and pc boards.
Might just actually build this monster by summer?

20th November 2010, 11:53 AM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	compare your hi current 9V supply to what is shown on the regulator datasheet. __________________ regards Andrew T.

20th November 2010, 12:00 PM	#4
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 46	Schematic in post #2 has several serious errors that I can see. 2N3055 is NPN, the LM337 is backwards. Neither LM3X7 has the correct wiring to the ADJ pin, R3 and R4 are potentially transposed. __________________ I think ideas are what you want to get rid of. I don't really like songs with ideas. - Leonard Cohen

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20th November 2010, 08:22 PM	#6
MJL21193 Account disabled at member's request Join Date: Mar 2007	Howdy! The LM317 has the wrong pin out on you scheme - Pins: 1-in, 2-adj, 3-out. The LM337 has the wrong pin out on you scheme - Pins: 1-adj, 2-in, 3-out. The LM337 is still backwards. You are shorting the adjust pins of both regulators to ground. C11 and C12 are not needed if the LM7809 is within 4 inches of the main filter caps.

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