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Author Topic: Tascam DR-70D 4-channel audio recorder (Part 7)  (Read 32652 times)

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Offline voltronic

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Re: Tascam DR-70D 4-channel audio recorder (Part 7)
« Reply #75 on: June 24, 2016, 05:21:55 PM »
But still no ability to gang two channels?

Nope just the 701D has the ability to gang channels as of right now! No biggie for me, but it sounds like a relatively easy fix via new FW!

We've been saying that for quite a while now...

I haven't installed 1.14 yet but I'm guessing they haven't fixed the dead zone at the bottom of the gain pots.   I say again, we all need to email them to complain about these issues in order for them to consider fixing them.
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Offline Carlos E. Martinez

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Re: Tascam DR-70D 4-channel audio recorder (Part 7)
« Reply #76 on: June 25, 2016, 07:03:15 AM »
Anyone is using an external AC supply that is not the original Tascam one?

Offline Life In Rewind

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Re: Tascam DR-70D 4-channel audio recorder (Part 7)
« Reply #77 on: June 25, 2016, 10:53:10 AM »
Anyone is using an external AC supply that is not the original Tascam one?

I doubt it...it doesn't come with a power supply - and most USB batteries power the unit for longer than most of us can stay awake.

I've never heard any reference to anyone running with AC...
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Offline voltronic

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Re: Tascam DR-70D 4-channel audio recorder (Part 7)
« Reply #78 on: June 25, 2016, 01:36:26 PM »
Anyone is using an external AC supply that is not the original Tascam one?

I doubt it...it doesn't come with a power supply - and most USB batteries power the unit for longer than most of us can stay awake.

I've never heard any reference to anyone running with AC...

It will run from any 5V / 1A supply, so that would be pretty much any USB phone charger or a USB port on a computer (as well as the thousands of external cell phone batteries many of us use).  I sometimes power it from an old cell phone charger when doing card formatting or when I was testing large SD cards and running them for many hours.
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Offline Carlos E. Martinez

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Re: Tascam DR-70D 4-channel audio recorder (Part 7)
« Reply #79 on: June 26, 2016, 12:08:25 PM »
It's quite likely any external battery designed for cell phones is compatible with the Tascam, and should last more according to capacity.

Now what about internal rechargeable AAs?

Any brand or type in particular?

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Re: Tascam DR-70D 4-channel audio recorder (Part 7)
« Reply #80 on: June 26, 2016, 12:39:43 PM »
It's quite likely any external battery designed for cell phones is compatible with the Tascam, and should last more according to capacity.

Now what about internal rechargeable AAs?

Any brand or type in particular?

I treat the internal batteries as more of a UPS. They don't have enough capacity to get me through a show with two channels of Phantom. The unit does however switch over to internal batteries if the external supply stops providing power. It also puts up a notice on the screen that you have switched to internals. At this point I can switch in a spare USB battery and continue.

I do find that I use wall power quite a bit when recording 4 track. Since the units power spec is the same as USB 2.0's power spec, 5V 1A, any USB charger with microUSB cable works well. Standards for the win.
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Offline Carlos E. Martinez

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Re: Tascam DR-70D 4-channel audio recorder (Part 7)
« Reply #81 on: June 26, 2016, 01:11:15 PM »
Thanks, that's what I also guessed about using an external USB charger as PS.

There are some better ones to pick from, also low in price.

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Re: Tascam DR-70D 4-channel audio recorder (Part 7)
« Reply #82 on: June 26, 2016, 06:05:38 PM »
http://www.ebay.com/itm/331541674213?_trksid=p2057872.m2749.l2649&var=540700709758&ssPageName=STRK%3AMEBIDX%3AIT

A few of us have purchased this external.  Works great and blends in seamlessly with the recorder.
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Offline Carlos E. Martinez

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Re: Tascam DR-70D 4-channel audio recorder (Part 7)
« Reply #83 on: June 27, 2016, 08:33:16 AM »
I have already asked, but they do not seem to ship to Brazil, where I live. But his one does:

http://www.ebay.com/itm/Ultrathin-USB-12000-20000mAh-Portable-External-Battery-Charger-Phone-Power-Bank/361539787005?_trksid=p5411.c100167.m2940&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20140131123730%26meid%3D88a791baa4134ecdab124a69dc2cd846%26pid%3D100167%26rk%3D2%26rkt%3D13%26sd%3D331541674213

It seems to be similar, and it comes in 50Ah capacity, which is quite a lot.

From the batteries I have here, the Tscam only seems to work with an Anker Astro Pro, but it is a bit large.

It's a pity most recommended brands sold in the USA additionally charge two times the battery value for shipping.

So I have to find batteries coming from Asia, and they are not all reliable.

Offline Carlos E. Martinez

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Re: Tascam DR-70D 4-channel audio recorder (Part 7)
« Reply #84 on: June 27, 2016, 08:38:12 AM »
For the AAs, I've already ordered some Sanyo Eneloop AA types, that are quite reliable.

That should protect me from any glitches in the external supply, I guess.



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Re: Tascam DR-70D 4-channel audio recorder (Part 7)
« Reply #86 on: June 28, 2016, 03:25:02 AM »
For the AAs, I've already ordered some Sanyo Eneloop AA types, that are quite reliable.

That should protect me from any glitches in the external supply, I guess.



Good idea ;) I keep some Energizer 2300mah NIMH AAs in my [2] 70d's at all times, so that the time/date are always accurate! It slows me down when I have to figure out the correct date/time when starting the 70D up and needing to record quickly! And then I just recharge them before showtime, so that they're full, and if anything happens to my USB batteries, I am covered! Running AAs in the 70D also allows you to "hotswap" USB batteries too! That way, you will literally NEVER run out of power! Just keep exchanging USB batteries in the 70D and you can run continuously forever, as long as you have AAs in the 70D ;D Pretty damn cool IMO!
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Offline voltronic

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Re: Tascam DR-70D 4-channel audio recorder (Part 7)
« Reply #87 on: June 28, 2016, 12:40:44 PM »
Since it's being discussed again, here's some pics of the popular eBay Power Bank battery mounted under my 70D with blu-tack.  The battery cable is a cheapo off eBay also, just like this one.  You want to look for a "left angle" on the miniUSB end for the cable to go this way.  XLR cables are custom "blacked out" GAKables.

I've mentioned this before in some other thread - the battery is not really 20,000 mAh.  From the item description:
Quote
    High capacity: 20000mAh.

    Note:nominal capacity: 20000mAh, battery, actual capacity: 12000-18000mAh

Not that it really matters in practice, though.  Mine runs for at least 10 hours powering 4 mics, and after that it still shows 50% capacity (if the indicators are to be trusted, which they're not).

As for rechargeable AAs, I use the Duracell Ion Core in my FP24.  They are re-branded Eneloop XX's but sell for much less where I am.  My local grocery store stocks them.
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- Gustav Mahler

Offline F.O.Bean

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Re: Tascam DR-70D 4-channel audio recorder (Part 7)
« Reply #88 on: June 28, 2016, 09:30:32 PM »
I have looked EVERYWHERE online and in both 70D manuals, and cant find out how much voltage the 70D's PIP[Plug In Power] supplies to the mics through the EXT POWER 1/2 1/8" Mini jack? Is it the proper 9v PIP that most mics require ??? Or is it a smaller voltage than 9v ???

TIA,
Bean
Schoeps MK4's & MK41's ->
Schoeps | NBob 250/05 KCY's ->
Schoeps VMS02IB | Naiant +60v PFA's ->
DarkTrain Right Angle Stubby XLR's ->
Tascam DR-70D's ->
128gb & 64gb SanDisk Extreme Pro SD Cards

FiiO E10K DAC/HP Amp & E11K HP Amp ->
Sony MDR-7506 Cans & SA-VA15 Speakers | Monster iSport Victory Earbuds

http://www.archive.org/bookmarks/diskobean | http://www.archive.org/bookmarks/Bean420 | http://bt.etree.org/mytorrents.php

Offline voltronic

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Re: Tascam DR-70D 4-channel audio recorder (Part 7)
« Reply #89 on: June 28, 2016, 10:01:29 PM »
I have looked EVERYWHERE online and in both 70D manuals, and cant find out how much voltage the 70D's PIP[Plug In Power] supplies to the mics through the EXT POWER 1/2 1/8" Mini jack? Is it the proper 9v PIP that most mics require ??? Or is it a smaller voltage than 9v ???

TIA,
Bean

I can't find it in the manual either, but I'm pretty sure PIP inputs on any portable recorders like the 70D is much lower than 9V.  Just because the mics we might be using with these inputs might require ~9V for best performance doesn't mean that's what we're getting, unless we use a battery box.

Here's a quote from the article Powering Microphones on microphone-data.com (PDF warning):
Quote
Plug-in Power
For microphones that are designed primarily for the domestic market and have an unbalanced output connection the system known as “plug-in power” provides a comparable supply configuration – perhaps 10-20mW at <5V.  In this case the feed is from the device that the microphone connects to – usually a recorder of some form, though computers and mobile phones use a similar arrangement. The problems of battery switching and condition no longer apply but the restrictions on output and cable driving are unchanged.

Someone measured the M10 PIP supply voltage at one point and I seem to remember it being around 3V.  I wouldn't expect the 70D to be much different.  Anyone here have the means to measure this?
DPA 4061 | Line Audio CM3 | Naiant X-Q
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Tascam DR-70D FAQ
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Quote
I am hitting my head against the walls, but the walls are giving way.    ///    If a composer could say what he had to say in words he would not bother trying to say it in music.
- Gustav Mahler

 

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