Discuss Yocto construction and related issues
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- Posts 37
- Joined: Jan 2nd, '14, 17:03
Check Mate wrote:Hi Guys,
I only have a minor issue with my Cowbell. The Tuning-Range of TM1 is not enough although I already changed the Resistor to a 100k.
I get a C with max Trimmer Setting but I cannot get a good Cis (as it is supposed to be).
Is there anything I can do to extend the tuning range (maybe change the resitor to an even lower value)?
I had to change the 2 x resistors as below to get the correct pitch -
Adjust TM1* up to a period of 1.85ms. If TM1* adjustment range is not large enough for this period change the value of R44 * per a resistor of 100Kohm. (supplied in kit)
Adjust TM2 * up to a period of 1.25ms. If TM2* adjustment range does not allow you to get this period change the value of R45 * per 68kohm. (Supplied with the kit).
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- Posts 69
- Joined: Jan 7th, '14, 18:36
@seven
Thanks for your reply but as I wrote above I already cheanged the resitors R44 to 100k and R45 to 68k and I still cannot get a clean Cis out of TR1.
So I'd like to know what I can do to to extend the range of TM 1 even more?!
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- Posts 69
- Joined: Jan 7th, '14, 18:36
...is there anybody who can help to resolve the issue? E-Lictronic? It is much appreciated!!
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- Posts 519
- Joined: Feb 16th, '11, 13:36
Check Mate wrote:...is there anybody who can help to resolve the issue? E-Lictronic? It is much appreciated!!
Could you post a sound card oscilloscope screen shoot of your measurement?
Best regards,
e-licktronic
Best regards,
e-licktronic
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- Posts 6
- Joined: Jan 3rd, '14, 10:49
Hello, seems to have the same problem, i already changed R44 and R45, i tried after osc mesurement to make it by ear, and it seems that TM1 range, isn t large enough to reach the 808 cowbell sound...Do you have an idea?, is it possible to replace R44 with a lower resistor than 100k ?Or the problem could be something else?
thanks!
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- Posts 69
- Joined: Jan 7th, '14, 18:36
Hi Guys,
Patrick was so kind and exchanged Resistor R44 with a Trimmer set to 50k.
I was able to tune my Cowbell to the exact tune of an original 808 (Db / Ab).
With changing Resistor R44 to 50k you should get the same result.
Best,
CM
Last edited by
Check Mate on Jul 20th, '14, 07:57, edited 1 time in total.
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- Posts 69
- Joined: Jan 7th, '14, 18:36
Here's the link to the sound:
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- Posts 2
- Joined: Jun 14th, '16, 09:32
Check Mate wrote:Hi Guys,
Patrick was so kind and exchanged Resistor R44 with a Trimmer set to 50k.
I was able to tune my Cowbell to the exact tune of an original 808 (Db / Ab).
With changing Resistor R44 to 50k you should get the same result.
Best,
CM
I have the same issue with the Cowbell in my Yocto. I would like to know:
1) Was the Resistor on R44 faulty? Do you have a replacement (or new) part number?
2) Can I still use the existing Trimmer or is it required to buy a new one as well? Part number?
3) Did you revert R45 back to the original Resistor or does that need to be 68k for this to work?
Thanks,
Mark
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- Posts 154
- Joined: Apr 19th, '16, 13:35
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- Posts 154
- Joined: Apr 19th, '16, 13:35
Changed the Q1 +Q5 transistors to new ones, still the same. (Have no clue what I'm doing)
What next?