[sci.electronics] 2 Channel mixer gif

dam@cs.glasgow.ac.uk (Mr David Morning) (01/09/91)

Thanks to all who responded to my post some time ago about posting 
small circuits and the Herculese monitor. The giffers wone by a long
way the final totals being:-
Giff= 13
Postscript=5
HPGL=1
After struggling for some time with the vagries of going from a Mac using
MacDraw to uuencoded gif format I think I've finally cracked it and
managed to remove the Mac headers. Treat the enclosed file as a test. Any
problems or suggestions e-mail me. The image is slightly larger than VGA
mainly because I couldn't squash it in any more but as most giffers scroll
it should be o.k. If it *REALLY* causes a pain then e-mail me and I'll see
if I can squash it up a bit and re-post but that will cause me *REAL* pain!!
Constructive comments welcomed. I'm always looking to improve!!

This is in response to a request posted for a schematic of a 2 channel audio
mixer with a facility to send to an echo unit. Each channel has a seperate
volume and effects send control. There is also a master volume and master
return. Power is off either 2x 9volt batteries or a +12-0--12v supply.
Put it in a metal screened box to cut down pick-up and ground the box to the
zero volt line. The original poster didn'say what what he was plugging into
it so the gain is set to around 5.5 but this can be changed by reducing
R3 for Ch.1s' to increase it and R6 for channel 2 or make them pots for
a variable gain but put a limiting resistor in series with the pots to
stop it going crazy when the pot is set to zero resistance ie gain of
almost infinity. The gain can be calculated from (47k+R6)/R6.
Use metal film resistors and tantalum capacitors if noise levels are
important otherwise carbon and normal electrolytis are fine.
A TLO72 can be used as a direct replacement for the NE5532 but it does
noise figure is marginally poorer. Don't use 741 variants unless you plan
setting the gain to unity and using 5 volt signal levels, their rather
noisy beasts.
Parts list is as follows in case it doesn't show up in your giffer.
IC1,2.....NE5532
C1,3......O.22uF
C2,4
C5,6......10uF/25v
R1,4......100k
R2,5......47k
R3,6,7,
8,9,10,11
12,13.....10k
All sockets 1/4in
jacks
Power off 2 x 9 v batteries or +/-
12v.

File is uuencoded gif format. No trailers so you don't have to worry about
scrolling through the entire document to remove a line at the end.
Delete every thing up to and including the line "-----cut here-----" with
your favourite editor.
Uudecode it.
View with your favourite gif viewer
The picture size is slightly wider but shorter than VGA (it's 770 x 475 I 
think) but most giffers can scroll so it shouldn't be a problem.
E-mail your comments please.

Dave





---------------------cut here-------------------------------
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