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January 22, 2021, 08:05:18 PM

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Author Topic: Guitar amplifier Acoustics Torque 12  (Read 2547 times)

dmeek

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Re: Guitar amplifier Acoustics Torque 12
« Reply #15 on: April 25, 2020, 10:38:39 AM »
Here is the schematic

julio daniel

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Re: Guitar amplifier Acoustics Torque 12
« Reply #16 on: April 26, 2020, 04:16:56 AM »
Hello everyone
Thanks dmeek for the nice work.
Any suggestions to optimize this circuit?
Best regards.

dmeek

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Re: Guitar amplifier Acoustics Torque 12
« Reply #17 on: April 26, 2020, 09:19:01 AM »
If you replace the transformer with a 17V version, you will have to upgrade some other components.
Change the 1N4002s to 1N5404, Change the 2200 uF caps to 3300/35V, Change the 2 100Ω feeding the zeners
to 220Ω/2W.

Here is a way to connect the reverb module. You have two choices for the input.

dmeek

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Re: Guitar amplifier Acoustics Torque 12
« Reply #18 on: April 26, 2020, 11:07:43 AM »
Are you sure the 47K resistor at the input is correct? 470K or 1M would be better, and change the input capacitor from .22 to .022.
« Last Edit: April 26, 2020, 04:43:58 PM by dmeek »

julio daniel

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Re: Guitar amplifier Acoustics Torque 12
« Reply #19 on: April 27, 2020, 05:22:15 AM »

Hello everyone
Thanks dmeek for the suggestion, as for the input resistance of 47K, it is what is mounted, however I will try to change the value to about 1M, as well as the capacitor, I will test with 0.022, but it all depends on the arrival of the reverb tank, which is delayed due to the current situation.
Best regards.

julio daniel

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Re: Guitar amplifier Acoustics Torque 12
« Reply #20 on: June 13, 2020, 10:16:38 AM »
Hello everyone. After several months waiting for ordered material and several attempts, to reach a definitive result, "some failed", I can already present the results of the change "or upgrade" of my Torque T12. The changes I made, after some time of reflection, and some suggestions that you sent me, turned out not to be difficult to execute, that is: I added a reverb line like MOD 9EB3C1B, the result was good but I didn't stop there , as I had already done several experiments with lines built by me, using a small loudspeaker of 8 omhs, as an exciter and as a receiver a piezo unit, normally used in acoustic warning devices. I placed the two lines in parallel, with the appropriate impedance adaptations, made a little randomly and after a few attempts and experiments the final result paid off, in my humble opinion. The result was achieved with a Fender T-bucket 350-E NAT Acoustic guitar, crafted in Indonesia, with Fishman preamp. The audio file was recorded with my old man, already 10 years old, Compaq CQ61SP100, maybe there is a background noise that is not noticeable when the amplifier is used, only for the guitar. Greetings to all and thank you very much for your cooperation. J.B.