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Marketplace => Black Market => Topic started by: volker on January 26, 2015, 11:15:12 AM

Title: FS: THAT1512 preamp pcbs
Post by: volker on January 26, 2015, 11:15:12 AM
(http://abload.de/thumb/xpre7rug5.jpg) (http://abload.de/img/xpre7rug5.jpg)

The pcb holds two mic preamps on one board (can be seperated if necessary). The circuit is based on the THAT1512 for amplification and a THAT1646 output section. Additionally, a DC servo is used so there is no other capacitor in the direct signal path other than the phantom blocking cap. It also Features relay switched input pad and output polarity reversal. Overall, a very clean and clear sounding mic preamp.

10€ each, I have five pieces available. For 6€ I also have an appropriate power supply pcb that will feed several of these boards.
Title: Re: FS: THAT1512 preamp pcbs
Post by: zebra50 on January 26, 2015, 12:26:17 PM
Hi Volker,

I would like one! I built something very similar on perf board some years ago, and this will tidy it up nicely.

How to pay?
Stewart
Title: Re: FS: THAT1512 preamp pcbs
Post by: volker on January 26, 2015, 12:43:59 PM
Hi Stewart,

preferably bank transfer, I am happy about every cent that doesnt go into Paypal's greedy claws  ;). But Paypal is fine too of course if that is your only option. Postage to the UK should be 1,50€ I think, I'll send you a pm!


Volker
Title: Re: FS: THAT1512 preamp pcbs
Post by: Humner on January 26, 2015, 06:29:05 PM
Hi,

I'm after 1 of these(which is a pair correct?)

I have sent PM - thank you

Rob
Title: Re: FS: THAT1512 preamp pcbs
Post by: shabtek on January 26, 2015, 09:27:36 PM
i'll take 1 or 2
Title: Re: FS: THAT1512 preamp pcbs
Post by: flaheu on January 27, 2015, 03:22:40 AM
HI,

I'll take the last one, or 2 if Shabtek takes only one.

Thanks
Title: Re: FS: THAT1512 preamp pcbs
Post by: zebra50 on February 16, 2015, 05:43:00 PM
The boards are here! Thank you Volker!
Title: Re: FS: THAT1512 preamp pcbs
Post by: Humner on April 02, 2015, 12:06:20 AM
I have a pair of these PCB's which I wont be using. Happy to sell off at cost price to anyone interested.

Also have 2 THAT1510 chips which I can see with them if wanted. Please PM for further details.
Title: Re: FS: THAT1512 preamp pcbs
Post by: e.oelberg on April 02, 2015, 05:16:49 AM
I take one board... looks great

Title: Re: FS: THAT1512 preamp pcbs
Post by: e.oelberg on April 02, 2015, 05:18:08 AM
would be fantastic to have a high quality battery power supply with it, with ±16 & 48 Volt
Title: Re: FS: THAT1512 preamp pcbs
Post by: volker on March 14, 2017, 11:49:14 AM
I still get requests for these boards every once in a while. I might be ordering some in the near future for myself, if anybody else is interested let me know.
Title: Re: FS: THAT1512 preamp pcbs
Post by: culteousness1 on March 14, 2017, 12:01:23 PM
Hi Volker,
I am interested in a stereo set plus a PSU board.
Cheers
Carsten
Title: Re: FS: THAT1512 preamp pcbs
Post by: charlie2012 on May 11, 2017, 06:57:01 PM
Hi

If you are ever getting more made I would like 8 of them.

Thank you.
Title: Re: FS: THAT1512 preamp pcbs
Post by: okgb on May 12, 2017, 11:23:16 AM
If you need people to commit , I'd take another pair
Title: Re: FS: THAT1512 preamp pcbs
Post by: volker on July 04, 2017, 10:07:26 AM
PCBs finally arrived today. Production took forever, then shipping, and they were stuck in customs for almost two weeks  :o...

I'll send PMs to anyone who showed interest, but there are more of course for others to take.
Title: Re: FS: THAT1512 preamp pcbs
Post by: culteousness1 on July 04, 2017, 10:57:27 AM
Hi Volker,
Thanks for the PM. I just sent you an Email  8)
Cheers
Carsten
Title: Re: FS: THAT1512 preamp pcbs
Post by: jarvis on May 05, 2018, 10:14:01 AM
Hey Volker,
do you still have any of these boards available?
I'd be interested in buying 4 preamp boards (for 8 channels, correct?) and one of the psu boards (unless I'd need something beefier to power 4 boards).

Cheers
Jannis
Title: Re: FS: THAT1512 preamp pcbs
Post by: vizcities on September 26, 2018, 03:56:39 AM
I'm interested in these as well! (Or, alternately - and perhaps preferably -  a schematic so I can whip together a vero version.)
Title: Re: FS: THAT1512 preamp pcbs
Post by: volker on September 26, 2018, 07:53:51 AM
I still have plenty of these, several people who had initial interest didn't go through with their order. Send me a PM.
Title: Re: FS: THAT1512 preamp pcbs
Post by: Rob Flinn on May 29, 2019, 05:28:26 AM
Hey Volker.

I'm having some issues with RF noise building these mic amps.  I'm trying to PM you but you inbox is full.

I'm having some issues with HF oscillation in that at anything other than minimum gain the output signal is swamped with RF hash.    Has anyone else had any issues like this ?

Can I ask you how you wired the gain switch.  Other than resistor values there is nothng about this.  Are they in a ladder network or wired so just the 1 resistor is across the gain ?

Also was there any build thread for these mic pres on the forum ?


Title: Re: FS: THAT1512 preamp pcbs
Post by: volker on July 02, 2019, 06:10:21 AM
Ordered some more once again, anybody interested let me know!


(also, Rob's issues have been resolved  ;))
Title: Re: FS: THAT1512 preamp pcbs
Post by: rackmonkey on July 11, 2019, 09:43:09 PM
Since i’m about to stuff a few of these, i’d be curious to know what Rob’s issue was about. Is it documented anywhere?

Thanks!

BT