Search found 8 matches

by mrclunk
Tue Jul 07, 2020 12:08 am
Forum: JLM Audio Kits
Topic: 8 Channel Relay Switch Build Thread
Replies: 18
Views: 10183

Re: 8 Channel Relay Switch Build Thread

Thanks Joe,
successfully installed my box in studio yesterday.
After a few balanced to unbalanced wiring cock ups it works a treat!
I'd read the IDC connector pin out as 1 = Shield 2 =Hot 3 =Cold 3 etc.. But it's 1 = Shield 2=COLD 3=hot so the unbalanced console SND and RTNs didn't work..
by mrclunk
Wed Jun 24, 2020 12:59 am
Forum: JLM Audio Kits
Topic: 8 Channel Relay Switch Build Thread
Replies: 18
Views: 10183

Re: 8 Channel Relay Switch Build Thread

Sorry, i'm confused about the regulator too.. So i'm using 9 relay boards hence 74 x 12VDC relays. I'll use a 24VDC PSU. So does the 7812 regulator will drop the voltage for the whole circuit or just for the ULN2803?? According to the schematic it does but what you said early in this thread has conf...
by mrclunk
Fri Jun 19, 2020 7:56 pm
Forum: JLM Audio Kits
Topic: 8 Channel Relay Switch Build Thread
Replies: 18
Views: 10183

Re: 8 Channel Relay Switch Build Thread

thanks Joe,

Balls! Anyone need 75 x 12v signal relays??
Ordered the wrong size. :lol: :lol:

Sure i can return them.
-----------
For anyone in UK NEC / Kemet / IMO EA2 series relays fit.
by mrclunk
Wed Jun 10, 2020 9:37 pm
Forum: JLM Audio Kits
Topic: 8 Channel Relay Switch Build Thread
Replies: 18
Views: 10183

Re: 8 Channel Relay Switch Build Thread

Hi,
just ordered a bunch of these boards for a tape machine switch over box.
What is the relay footprint for the PCB?

5.0mm pin spacing? 7.26mm wide?
thanks
Paul
by mrclunk
Tue Dec 10, 2019 8:45 pm
Forum: JLM Audio Kits
Topic: Talkback Comp Build Thread
Replies: 16
Views: 12815

Re: Talkback Comp Build Thread

I'm sorry Joe, i ment to update my post... Mic worked fine using the standard (2 x 6k8) supply as on the pcb. It's an Astrada conference mic 952.353UK (just the gooseneck mic part) All working nicely on our Calrec. I added a 1k Log pot across the output for volume and a cheap OEP a262a2e transformer...
by mrclunk
Wed Dec 04, 2019 2:56 am
Forum: JLM Audio Kits
Topic: Talkback Comp Build Thread
Replies: 16
Views: 12815

Re: Talkback Comp Build Thread

So i couldn't find a high brightness LED that would work so i made a little TL072 buffer circuit to drive an GR LED. Works well. Next question.. How would i go about powering an Electret (TB) mic with this circuit? Can i just remove one of the 6K8 resistors and put a 9V zener across the PP to ON jum...
by mrclunk
Sat Aug 17, 2019 10:01 pm
Forum: JLM Audio Kits
Topic: VU BUFFER & PEAK LED KIT BUILD THREAD
Replies: 100
Views: 86874

Re: VU BUFFER & PEAK LED KIT BUILD THREAD

If i want to sum a balanced stereo signal to mono for inputing to the one of these boards, what's the best way?
This would hang off the mix bus so wouldn't want it to affect signal.
Do i need to add a buffer?

Is the circuit attached overkill?
balmix.jpg
thanks
by mrclunk
Fri May 24, 2019 10:45 pm
Forum: JLM Audio Kits
Topic: Talkback Comp Build Thread
Replies: 16
Views: 12815

Re: Talkback Comp Build Thread

Is there anyway to add very simple GR metering on this? Doesn't need to be accurate. I've VU buffer pcb's handy if that simplify things?
thanks
Paul