Le Roux

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2220 on: July 15, 2018, 04:39:52 PM »
Adding a pic of my 4 channel!



Whoops

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2221 on: July 15, 2018, 10:16:03 PM »
So if Iwanted a 1200  ohm input with the vtb9045, I would eliminate the jumper between pins 3 and 4, and then jumper pins 2 and  3, and 4 and 5?

No, it's the opposite

For a 1200  ohm input impedance you need the primaries connected in Series, so you connect Signal + to Pin2, Jumper 3 and 4, and connect Signal -  to Pin 5





Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2222 on: July 15, 2018, 11:03:11 PM »
No, it's the opposite

For a 1200  ohm input impedance you need the primaries connected in Series, so you connect Signal + to Pin2, Jumper 3 and 4, and connect Signal -  to Pin 5





That is the wiring according to Martin's build guide, which I believe is 300 ohm.
Correct me if Im wrong, but that was my assumption.
« Last Edit: July 15, 2018, 11:10:17 PM by Chrome Heart »
P&P Sound Studio

Whoops

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2223 on: July 16, 2018, 10:35:44 AM »
That is the wiring according to Martin's build guide, which I believe is 300 ohm.
Correct me if Im wrong, but that was my assumption.

Yes Martin's build guide shows that wiring but thats a Series connection so more turns on your primaries which gives you a lower turns ratio (and higher impedance primary), 1k2 in this case

Putting them in parallel gives you half the turns on the primary side, so it doubles your turn ratio, and makes your primary impedance four times lower.


Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2224 on: October 11, 2018, 06:11:10 PM »
sorry for the stupid question, but, is it possible to use a potentiometer instead of a rotary switch on the input sensitivity control?

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2225 on: October 11, 2018, 06:22:44 PM »
sorry for the stupid question, but, is it possible to use a potentiometer instead of a rotary switch on the input sensitivity control?
The pcb is designed to use the Grayhill, even if you could jackleg a pot in there it wouldn't be worth the hassle.
P&P Sound Studio

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2226 on: October 11, 2018, 06:40:15 PM »
Thanks
I’m not referring to the PCB layout, I’m just wondering if circuit-wise a potentiometer could replace the rotary switch. Obviously in reality is not pratical with this PCB layout

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2227 on: October 11, 2018, 07:15:11 PM »
Thanks
I’m not referring to the PCB layout, I’m just wondering if circuit-wise a potentiometer could replace the rotary switch. Obviously inwe reality is not pratical with this PCB
Thanks
I’m not referring to the PCB layout, I’m just wondering if circuit-wise a potentiometer could replace the rotary switch. Obviously in reality is not pratical with this PCB layout
Sorry. Since this thread primarily addresses Martin's pcb and build, I responded accordingly.
P&P Sound Studio


 

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