You can still use the registry feedback card included with your item, or email any queries to enquiriesstudiomaster.com.This is handled and managed through the businesspersons from which your product was purchased.
All OFFLINE buy now button items (see Ordering Information page for details). ![]() ![]() Note: Includes Expansion Chassis info. Dated 1988) (18pages25). Note: Includes two different versions. Dated 1982-84) (14pages20). Note: (Original, not for Pro Line 2) (Dated 1988-89) (13pages25). I think if you chase through the various scenarios it will work out the way I said previously The jack socket has 2 contacts that open when a plug is inserted and one that closes. Matt S. Hey there Just a friendly reminder that political discussion, (including offhand and sideways commenting) is not permitted on the Gearslutz forums. Hello, I have come across this schematic of an old little Studiomaster mixer, which people seem to love here. I wanted to check its input sections sound (from the TRS input jack to just before the eq) and started mounting it in my protoboard, excluding only the mic XLR input. However, as I am not an engineer and have limited experience with electronics, I got confused in the very beginning when I saw a lot of connections coming from the input jack, not only 3 for ground, hot and cold but 3 extra connections. I know these are normally disconnected in a mechanical way when a plug is put into it, but here they go to different stuff like the signal itself for instance (). Every other Studiomaster schematic Ive seen is perfectly understandable for me, but this is a step above my knowledge. Would you please explain me what is happening here Which wire would correspond to what And are these jacksXLR pins inverted in any way I mean, the tip of the line jack does not even touch pin 2 on the mics XLR. By the way, what is that 0 right after the TIP Thank you very much in advance. Hey, thanks a lot for your help The thing is, if its unbalanced input, how is that one connector goes to C2 and then to Q1, other connector goes to R6 and C3 then to Q2, and theres still another connector going to ground. If its unbalanced shouldnt I have only 2 connections for the input. Yes it is an unbalanced input for line but the ring contact actually goes to ground through a 1K3 resistor when the jack plug is inserted. It is a (fairly) cunning and cheap way to give a XLR balanced mic input and unbalanced line level without extra switching. It does have an advantage in that if it is fed from a balanced source, and you use a TRS cable the cold is not shorted directly to ground which can upset some output stages. Try working out where each of the contacts of the jack connect with plug out (as shown) and in, during which time the 3 switching contacts will change positions. I think it has been done this way so that the line input can be 47K input impedance. A common way to add a line input is to use a pad but this tends to give input impedances of 2 or 3 K Ohms which would not be suitable for some sources. Matt S. XLR pin 2 goes to C2 and has an open switch contact joined to it. The ring of the jack picks up the XLR pin 3 connection, but then breaks when you put the jack in. I think if you chase through the various scenarios it will work out the way I said previously The jack socket has 2 contacts that open when a plug is inserted and one that closes.
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