Hello,
Some news about the PCB of the future Q17-Turbo v2.
I worked on the ground plane on the top. This new ground plane should allow to remove R32 from the original schematic and to improve the SNR. I also added a double footprint for C3 and C6. We find less and less 47uF with 5mm pitch. I added the 2.5mm pitch. I also optimized the placement of the components everywhere above and below. I also put all the components to the correct size on the 3D model.
More in the next episode.
Regards,
Stef.
Some news about the PCB of the future Q17-Turbo v2.
I worked on the ground plane on the top. This new ground plane should allow to remove R32 from the original schematic and to improve the SNR. I also added a double footprint for C3 and C6. We find less and less 47uF with 5mm pitch. I added the 2.5mm pitch. I also optimized the placement of the components everywhere above and below. I also put all the components to the correct size on the 3D model.
More in the next episode.
Regards,
Stef.
Attachments
Hello,
The other day, I told you about the existence of a 3uF MKP capacitor for C7. I finally cracked and ordered 2 for the future Turbo.
Cornell Dubilier - Film Capacitors POLY MET 100V 3uF - 935C1W3K-F
https://www.mouser.fr/ProductDetail/Cornell-Dubilier-CDE/935C1W3K-F?qs=BsPyPsHBXitmOy4GUpF/4Q==
They also fit in the Mini. Even better because they are shorter than the Vishay 2.2uF.
All that remains is to see what it will give in the circuit and when listening.
Stef.
The other day, I told you about the existence of a 3uF MKP capacitor for C7. I finally cracked and ordered 2 for the future Turbo.
Cornell Dubilier - Film Capacitors POLY MET 100V 3uF - 935C1W3K-F
https://www.mouser.fr/ProductDetail/Cornell-Dubilier-CDE/935C1W3K-F?qs=BsPyPsHBXitmOy4GUpF/4Q==
They also fit in the Mini. Even better because they are shorter than the Vishay 2.2uF.
All that remains is to see what it will give in the circuit and when listening.
Stef.
Attachments
Hello,
I started testing the first Q17-Turbo v2 prototype.
This prototype allowed me to adjust the circuit configuration and optimize the PCB. I changed some component values after testing and added the measurements on the diagram.
The specs are good and the power with the circuit configuration used will be 150W under 8R (with 60Vdc at input and 1.2V sensibility). It clip at 35Vrms.
I still have a lot of testing to do and some optimizations to try but it seems to be going well.
Regards,
Stef.
I started testing the first Q17-Turbo v2 prototype.
This prototype allowed me to adjust the circuit configuration and optimize the PCB. I changed some component values after testing and added the measurements on the diagram.
The specs are good and the power with the circuit configuration used will be 150W under 8R (with 60Vdc at input and 1.2V sensibility). It clip at 35Vrms.
I still have a lot of testing to do and some optimizations to try but it seems to be going well.
Regards,
Stef.
Attachments
Last edited:
Hi!
A pair of Vishay 100V mosfet.
Q1': SI2328DS
Q4': SI2325DS
With the SMD parts and 60V rails, zeners D2 and D4 MUST BE REPLACED by 16V 1N5246B zener to get 14V.
With the SMD parts, we get -3dB more on the 50Hz rejection.
I replaced Q6 with FQPF3N80C. With the Toshiba I got burst of oscillation > 32V. With the FQPF3N80C it's ok until the clip à 35V.
Stef.
A pair of Vishay 100V mosfet.
Q1': SI2328DS
Q4': SI2325DS
With the SMD parts and 60V rails, zeners D2 and D4 MUST BE REPLACED by 16V 1N5246B zener to get 14V.
With the SMD parts, we get -3dB more on the 50Hz rejection.
I replaced Q6 with FQPF3N80C. With the Toshiba I got burst of oscillation > 32V. With the FQPF3N80C it's ok until the clip à 35V.
Stef.
