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roubi

Mixpre-10t - Talkback mic

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Hi,

 

The SD MixPre-10t is a great machine, but I missed a mic to talk with the boomop.

 

As the inputs 9-10 can provide pip, I built a small talkback box.

I used one of the stock microphone I got with sony uwp d-11 (I am using Sanken cos-11), a switch I got from an old cheap solder iron and a 3d printer. It is pluged on inupt 9.

It works well, I haven't tried it in a live situation yet. It is then sent on output 2 with the boom to the boomop.

 

On the downside :

- you can't send input 9 or 10 in prefader mode (as there's no fader for it), so I have to route it on the right channel. It means I can't send anything else on the right channel and my mix has to be on the left channel only (booms + lavs ; usually, I send booms on left, and lavs on right). It is not a big issue as post will be done with isos most probably but still, I would love to have the possibility to send inputs 9 and 10 prefade.

-there's a "pop" when pressing and releasing the switch. I guess a capacitor could help but my electronic knowledge is not good enough to work on this without the fear to break something in the mixpre.

 

Hoping it could inspire some people...

 

 

 

 

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24 minutes ago, daniel said:

+1

How are you finding the USB controller for mixing of dialogue?

 

I just got it so I haven't tested it yet in a shoot situation but I am pretty sure it is not that great for mixing : the faders are very small and the 0 position is like at 1/3 from the top. My next shoot will be more mixing for director and reference sound. The post will be using isos ; so not a big problem for me at the moment.

Other than the size of the faders, the others controls are great. It is responsive, stable, plug and play.

It's also very light and small.

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On 2/8/2019 at 5:39 AM, roubi said:

-there's a "pop" when pressing and releasing the switch. I guess a capacitor could help but my electronic knowledge is not good enough to work on this without the fear to break something in the mixpre.

 

Cool!

 

I'm assuming that is a powered electret mic capsule, so the switch is connecting and disconnecting power from the MixPre-10t, and there's not a simple way to get power to the mic AND disconnect audio.  You could change to a dynamic element. You could battery power the existing within the box, isolate the audio line to the MixPre-10t with a series capacitor, and have the on/off switch after the capacitor on the way to the MixPre-10t.

 

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On 2/9/2019 at 8:19 PM, EmRR said:

 

Cool!

 

I'm assuming that is a powered electret mic capsule, so the switch is connecting and disconnecting power from the MixPre-10t, and there's not a simple way to get power to the mic AND disconnect audio.  You could change to a dynamic element. You could battery power the existing within the box, isolate the audio line to the MixPre-10t with a series capacitor, and have the on/off switch after the capacitor on the way to the MixPre-10t.

 

 

Hi,

 

Sorry for the late answer, I missed the notification. Indeed, it is a powered mic capsule ; it is the stock mic I got with the Sony UWP-D11 pack.

I don't want to care about another battery to change/charge so I don't want to a battery powered box. 

A dynamic mic would be a good option, but I like to use what I already have : those several stock UWP mics.

So that leaves the capacitor thing ; I just do not know enough about electronics to calculate this. If you know a bit about it, I'm all ears...

Thanks.

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@roubi Often it's done by wiring a LED in combination with the switch; if the switch is off, a red LED turns on, powered by the bias power, if it's off, the mic turns on. The load will stay constant then, so the pop will not occur. 

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6 hours ago, Vincent R. said:

@roubi Often it's done by wiring a LED in combination with the switch; if the switch is off, a red LED turns on, powered by the bias power, if it's off, the mic turns on. The load will stay constant then, so the pop will not occur. 

 

That sounds like a good idea. But it would need a switch with 3 positions, wouldn't it?

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3 hours ago, Vincent R. said:

Yes, well, not 3 positions, 3 tabs. One to solder output to, one to the led, one to the mic. But it's still 2 positions.

Indeed !

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