volker

FS: THAT1512 preamp pcbs
« on: January 26, 2015, 11:15:12 AM »


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.


zebra50

Re: FS: THAT1512 preamp pcbs
« Reply #1 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
Ribbon microphone services
http://www.xaudia.com
Microphone blog

volker

Re: FS: THAT1512 preamp pcbs
« Reply #2 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

Humner

Re: FS: THAT1512 preamp pcbs
« Reply #3 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

shabtek

Re: FS: THAT1512 preamp pcbs
« Reply #4 on: January 26, 2015, 09:27:36 PM »
i'll take 1 or 2
"really fine players do not use stomp boxes or master volume, they match the amp to the room and turn it up to 11.  Stevie Ray, BB King, Albert King, Duane Allman, Dicky Betts, Louis Armstrong"
   -CJ

flaheu

Re: FS: THAT1512 preamp pcbs
« Reply #5 on: January 27, 2015, 03:22:40 AM »
HI,

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

Thanks
As MagnetoSound said:
"Sad lack of balls in today's bands, IMO"

zebra50

Re: FS: THAT1512 preamp pcbs
« Reply #6 on: February 16, 2015, 05:43:00 PM »
The boards are here! Thank you Volker!
Ribbon microphone services
http://www.xaudia.com
Microphone blog

Humner

Re: FS: THAT1512 preamp pcbs
« Reply #7 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.

e.oelberg

Re: FS: THAT1512 preamp pcbs
« Reply #8 on: April 02, 2015, 05:16:49 AM »
I take one board... looks great


e.oelberg

Re: FS: THAT1512 preamp pcbs
« Reply #9 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


volker

Re: FS: THAT1512 preamp pcbs
« Reply #10 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.

culteousness1

Re: FS: THAT1512 preamp pcbs
« Reply #11 on: March 14, 2017, 12:01:23 PM »
Hi Volker,
I am interested in a stereo set plus a PSU board.
Cheers
Carsten
"What's all this analog stuff anyhow?" - Bob Pease
"My favorite programming language is ... solder." - Bob Pease

Re: FS: THAT1512 preamp pcbs
« Reply #12 on: May 11, 2017, 06:57:01 PM »
Hi

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

Thank you.

okgb

Re: FS: THAT1512 preamp pcbs
« Reply #13 on: May 12, 2017, 11:23:16 AM »
If you need people to commit , I'd take another pair
GKB Audio / Greg Boboski

volker

Re: FS: THAT1512 preamp pcbs
« Reply #14 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.

culteousness1

Re: FS: THAT1512 preamp pcbs
« Reply #15 on: July 04, 2017, 10:57:27 AM »
Hi Volker,
Thanks for the PM. I just sent you an Email  8)
Cheers
Carsten
"What's all this analog stuff anyhow?" - Bob Pease
"My favorite programming language is ... solder." - Bob Pease

jarvis

Re: FS: THAT1512 preamp pcbs
« Reply #16 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

Re: FS: THAT1512 preamp pcbs
« Reply #17 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.)

volker

Re: FS: THAT1512 preamp pcbs
« Reply #18 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.

Rob Flinn

Re: FS: THAT1512 preamp pcbs
« Reply #19 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 ?


regards Rob