PermO
Well-known member
While enjoying a BBQ a friend told me he needed to buy a master output module for his modular synth.
So we decided, let's make one, a really good one.
There's 10Vtt level in a modular system, so we don't need to add gain, but the impedance is rather high so I decided to do another version of the Proto Preamp instrument amp with a different gain structure and a headphone output instead of the FX output.
It's 2ch balanced output on mini XLR + phones.
![20230903_100954.jpg 20230903_100954.jpg](https://cdn.imagearchive.com/groupdiy/data/attachments/65/65958-2cf415fb601c2a44bcc510480e903b1a.jpg)
Last night we did a test run to figure out the resistors for the 6 pos stepped gain switch, it now has a nice range so it can drive anything.
Step 1 -10dB
Step 2 -6dB
Step 3 -3dB
Step 4 0dB
Step 5 +4dB
Step 6 +8dB
![20230902_210934.jpg 20230902_210934.jpg](https://cdn.imagearchive.com/groupdiy/data/attachments/65/65959-ac3097b42e538f2fe6273c869608b192.jpg)
It sounds really good, low end is incredible, tight, punchy, every little nuance in timbre comes trough nicely, I don't think I ever heard a synthesizer sound this good, I really love this chipset combination, it sounds amazing.
Here's what we did;
![20230903_101159.jpg 20230903_101159.jpg](https://cdn.imagearchive.com/groupdiy/data/attachments/65/65962-17082e0d02b479ada04fffbe49d5e14c.jpg)
Cheers !
So we decided, let's make one, a really good one.
There's 10Vtt level in a modular system, so we don't need to add gain, but the impedance is rather high so I decided to do another version of the Proto Preamp instrument amp with a different gain structure and a headphone output instead of the FX output.
It's 2ch balanced output on mini XLR + phones.
![20230903_100954.jpg 20230903_100954.jpg](https://cdn.imagearchive.com/groupdiy/data/attachments/65/65958-2cf415fb601c2a44bcc510480e903b1a.jpg)
Last night we did a test run to figure out the resistors for the 6 pos stepped gain switch, it now has a nice range so it can drive anything.
Step 1 -10dB
Step 2 -6dB
Step 3 -3dB
Step 4 0dB
Step 5 +4dB
Step 6 +8dB
![20230902_210934.jpg 20230902_210934.jpg](https://cdn.imagearchive.com/groupdiy/data/attachments/65/65959-ac3097b42e538f2fe6273c869608b192.jpg)
It sounds really good, low end is incredible, tight, punchy, every little nuance in timbre comes trough nicely, I don't think I ever heard a synthesizer sound this good, I really love this chipset combination, it sounds amazing.
Here's what we did;
![20230903_101159.jpg 20230903_101159.jpg](https://cdn.imagearchive.com/groupdiy/data/attachments/65/65962-17082e0d02b479ada04fffbe49d5e14c.jpg)
Cheers !