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Old 1st September 2011, 10:46 AM   #131
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It has been a while since I have seen this thread and I am glad to see you have made some progress by swapping to a lower noise transistor.
I had excpected the opamp circuit to be a little brighter sounding according to the sims.
It is very diffucult to tune it in the simulation with out knowing the actual tape head systems charicteristics,But was a good try for a basis to start on.
I still have the files if you would like me to try any other component changes sometime.
Otherwise for it sounding to bright how did it work out in the noise department vs gain ?
And which opamp did you end up using?

jer
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Old 6th September 2011, 05:18 PM   #132
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I used a fairly basic opamp, the TL082. If I could work out the EQ I think the noise would be fine.

Basically how this circuit behaved was that there was a rising response rather than a falling response at high frequencies.

The Mellotron has a second amp board which is the line amplifier. It strikes me that if I allowed for a circuit board that is the same size as both boards in the Mellotron, that a single opamp could do all the EQ/amp chores.

The sound of the instrument has more to do with the tapes than it does with the electronics so this might not be a bad move...
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Old 7th September 2011, 11:43 AM   #133
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Can you post a schematic of the circuit that you have come up with?
I you are using the TL082 you can use the second half as a buffer and attenuate the highs abit as well I think that I had mentioned this in an earlier post.

jer
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Old 9th September 2011, 04:37 PM   #134
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So far its just the circuit that you modeled earlier. The Mellotron has a very basic tone control to roll the highs- normally its turned all the way up.
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Old 11th September 2011, 06:46 AM   #135
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Okay Cool !!! I will do some searching for a suitible EQ'ing circuit for you.

jer
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