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------------------------------- begin 644 mixer.gif M1TE&.#=A"0/M 8 /___P "P "0/M 4 "_X2/J<OM#Z.<M-J+L]Z\ M^P^&XDB6YHFFZLJV[@O':'#0M6S8@![T.@X,[H2.'[!'3)*0RJ;S"8U*IU ? 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