Tweet
Howdy everyone,
I just posted this thought in my schematic revisions thread, but got to thinking it might be better as a thread of it's own. So here it is again...
I started playing with the original HH circuit with the following changes (all referenced from Carl's HHvD1 schematic):
I replaced R55-1k with 4.7k, replaced R39-1k with a 5k pot in series with a 4.7k to C22, and routed Q6 to IC9-pin 7 instead of pin 6. I also dropped R48 to ~1.5k, though I'm not sure if I needed to at this point.
The result is a smooth, stable tone that can be adjusted in pitch with the R39 5k pot replacement (the resistor in series lowers the base tone for the pot adjustment -the more k, the lower base tone at the minimums).
The result in the audio surprised me. It is nearly the 'sine wave' sound that I was looking for. Now I'm wondering if I have lost any audio sensitivity, and if so how to get it back.
More tests are needed, as usual. Hopefully someone here will give this a try so we can compare notes. It's a simple change to try.
I REALLY like the new audio, more like my Minelab Eureka (maybe that's why I like it?). MUCH easier on the ears. No more 'motor boat' crackling. I just hope I can tweak it to get the most out of it.
If anyone decides to give this a try, please post your results. I'd like to know what those of you in the the HH community think about the change and how to improve it.
Thanks, GTB
I just posted this thought in my schematic revisions thread, but got to thinking it might be better as a thread of it's own. So here it is again...
I started playing with the original HH circuit with the following changes (all referenced from Carl's HHvD1 schematic):
I replaced R55-1k with 4.7k, replaced R39-1k with a 5k pot in series with a 4.7k to C22, and routed Q6 to IC9-pin 7 instead of pin 6. I also dropped R48 to ~1.5k, though I'm not sure if I needed to at this point.
The result is a smooth, stable tone that can be adjusted in pitch with the R39 5k pot replacement (the resistor in series lowers the base tone for the pot adjustment -the more k, the lower base tone at the minimums).
The result in the audio surprised me. It is nearly the 'sine wave' sound that I was looking for. Now I'm wondering if I have lost any audio sensitivity, and if so how to get it back.
More tests are needed, as usual. Hopefully someone here will give this a try so we can compare notes. It's a simple change to try.
I REALLY like the new audio, more like my Minelab Eureka (maybe that's why I like it?). MUCH easier on the ears. No more 'motor boat' crackling. I just hope I can tweak it to get the most out of it.
If anyone decides to give this a try, please post your results. I'd like to know what those of you in the the HH community think about the change and how to improve it.
Thanks, GTB