November 9, 2015 at 1:31 pm #15338
Hi Ted, is it possible to have the schematics of joemeek mq1? I bought one on ebay but it doesn´t power on. Despite of not being a tech guy it would be a major help. Thank you for your time and attention. Hugo.November 9, 2015 at 9:54 pm #15997 I have sent the circuit diagrams to your email address.November 22, 2015 at 4:35 pm #15998 Uau Mr. Ted Fletcher! Thank you so much for your kindness and quick answer. Saying that you are an inspiration is something that you must be used to, but i´ll say it anyway. Thankful for your availability and for not being “industry standard”. I wish you all the best. Hugo.
(I´ve sent this message directly to your email on the 10th, but decided to post it anyway, just in case you missed it)November 22, 2015 at 4:38 pm #15999
Hi Ted once more. I want to rack the MQ1. It is working already, just needed some solder and tlc. What would be a correct external power supply for it. I see in the schematics 12 volt unreg., but a PC power supply is regulated, so i´m confused. Does the MQ1 regulate onboard? Could i use an unregulated 12VDC 1Amp psu? Would 1 amp be sufficient? Thank you for your time and attention. Hugo.November 22, 2015 at 8:05 pm #16000 The MQ1 has a very sophisticated regulator/power supply on-board. This power supply creates 13-0-13V for the audio and 48V for the phantom power.
So 12 volts DC at 1 amp from a regulated supply should be fine; you can try it from an unregulated 12V supply, it will not hurt anything, but a regulated supply might be best.November 22, 2015 at 9:47 pm #16001
Great! I ´m so impressed by your quick answers. Thank you so much.May 5, 2016 at 8:38 am #16002saxvoice78Participant Hi Ted, I just found this forum and am quite interested in the MQ1 schematics. I am looking at racking my MQ1 and I would find it very useful to have a wiring diagram of the 26 way cable that connects the the front interface with the rear board. The rear board has one button to activate the +48V Phantom Power and 4 TRS sockets, plus the connector for the XLR input cable, so is it just the case of soldering each wire from the 26 way cable to a number of TRS/XLR sockets and a switch? Thanks in advance.
ANDREAMay 5, 2016 at 2:23 pm #16003
Sorry to be a spoil-sport…. I’m afraid the only info have on the MQ1 is the circuit diagram, which does not help very much. I’m afraid the documentation on the interconnections got lost in one of my moves. Apologies.
If you do not have the circuit diagram, pls email me at
email@example.com I will email it back to you.May 5, 2016 at 6:48 pm #16004saxvoice78Participant Thanks Ted, yeah, I’d love to see the circuit diagram, I’ll drop an email to the email address you gave me. As regards the cable diagram, that’s no problem! If you look at the small PCB against a bright light you can see some kinda ‘paths’ going from the connecting pins of the cable to various places on the board, like the sockets, the switch and so on. Do you think that this is a good way to make a reasonable guess as to how the cable is wired or is it just a ridiculous idea destined to fail miserably?May 6, 2016 at 7:35 am #16005 That’s the way I would do it!
The MQ1 was an interesting design; the audio circuitry is excellent, the problems we had in design were all to do with the power supply. There were also some screening issues….. The interference to the audio can be really bad because the audio circuitry is fitted inside the computer. Nowadays these problems are much better understood.
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