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Old 26th November 2005, 12:25 PM   #1
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Default Marshall MS-2

Hi, I'm looking for a tested marshall ms-2 circuit diagram. Can anybody tell me where I can find it ?

Thanks in advance
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Old 26th November 2005, 10:26 PM   #2
Optical is offline Optical  New Zealand
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http://homepage.ntlworld.com/s.castl...enfuz/ms2.html
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Old 27th November 2005, 10:22 AM   #3
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Thank you Optical !
I was visiting the link and print the diagram. But a friend told me that he tried it and don't work very well (the volume level is very low).
Have you tried this circuit ?

Thanks again.
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Old 27th November 2005, 12:56 PM   #4
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It's only a VERY low power amplifier, the speaker is only rated at 0.8W, and without the overdrive switched ON, the input is directly into the power amplifier chip (so not much gain!). With the overdrive turned ON you should be able to drive the power amp fully, and get the most power you can from such a small amp.
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Old 27th November 2005, 06:07 PM   #5
teemuk is offline teemuk  Finland
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Quote:
Originally posted by Andronico
I was visiting the link and print the diagram. But a friend told me that he tried it and don't work very well (the volume level is very low
By a quick look i'd say that the 510 ohm resistor (in the output) is drawn into a wrong place in the schematic. As it is, it attenuates the whole output signal when it is supposed to do that only for headphone output.

Teemu K
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Old 27th November 2005, 07:02 PM   #6
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Very well spotted!, as you rightly say, the 510 ohm should ONLY feed the headphones.
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Old 28th November 2005, 11:35 AM   #7
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Thank you Nigel and Teemuk
I'll make the circuit without the 510 ohm resistor and test it myself.
I'll keep you informed about my results.
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Old 28th November 2005, 07:00 PM   #8
teemuk is offline teemuk  Finland
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Hi Andronico,

I did some simulations of the tonestack in the circuit and it seems to have an error too: The 0.01 uF capacitor (10 nF) should be 1 nF instead, (0.001 uF). At least with this value the pspice simulation has a "healthy looking" frequency response curve.

Anyway, the tonestack attenuates the input signal quite much so if you are building the circuit from a scratch it might be a good idea to add a switch that bypasses the tonestack.

Personally, i would redesign the preamplifier section so that it would have an extra gain stage to buffer the input properly and to make up the losses caused by the tonestack. After this i guess the poweramp's gain should be reduced too. In my point of view it's never a good idea to attenuate the low voltage guitar signal unless you prefer a hissing sound and poor SNR. It might be quite easy to implement a control for a variable drive too in the style of MS-4.

Teemu K
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Old 28th November 2005, 08:53 PM   #9
teemuk is offline teemuk  Finland
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Here's an accurate schematic.
Attached Images
File Type: gif marshall ms-2 microstack.gif (10.3 KB, 1205 views)
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Old 29th November 2005, 02:30 PM   #10
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Teemuk, thank you very much for your dedication ! During the next weekend I'll be making the amp using your corrected schematic.
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