Search found 184 matches

by chrisp
Mon Jul 26, 2010 1:33 pm
Forum: JLM Audio Kits
Topic: Hybrid -> Pultec type EQ ->Dingo Out ???
Replies: 3
Views: 12885

Re: Hybrid -> Pultec type EQ ->Dingo Out ???

Hi Bob I did draft a longish reply to this but didn't post it as it got a bit rambley. The simple answer is that yes, you could use a DINGO board to take the balanced output from your 7th circle, go through the EQ project of your choice, and use the DINGO to balance the output. With judicious fiddli...
by chrisp
Sat Jul 17, 2010 6:06 pm
Forum: JLM Audio Kits
Topic: BA BA2 BA4 BAD Dual99v Build Thread
Replies: 376
Views: 870887

Re: BA BA2 BA4 BAD Dual99v Build Thread

Paul

This should not be happening, its certainly not normal BA operation. Can you post some pics of your gain pot wiring and also the top and bottom of your BA build?
by chrisp
Sat Jul 03, 2010 1:38 pm
Forum: JLM Audio Kits
Topic: BA2 OEP/99v Newbie- 47uF Cap Query
Replies: 2
Views: 10750

Re: BA2 OEP/99v Newbie- 47uF Cap Query

Hi there Luke There are two 47uF caps which end up underneath the 99V opamp. Their pads are extremely close to those of several resistors (a 10k and a 51R each). I have soldered these in and there look to be shorts between the outside legs of each 47uF, and the nearest 10k to each, and the leg of ea...
by chrisp
Sat Jul 03, 2010 11:45 am
Forum: JLM Audio Kits
Topic: MONO Ver1 Mic pre kit BUILD THREAD
Replies: 23
Views: 86046

Re: MONO Mic pre kit BUILD THREAD

Hi JimiB Of course it is possible to put in a send/return loop, but what would be the point? And I'm not sure what you mean by parallel - parallel to what in the preamp circuit? This is a single variable gain stage design (the second half of the opamp is effectively a 2:1 gain but its role is really...
by chrisp
Sat Jun 26, 2010 9:10 am
Forum: JLM Audio Kits
Topic: BA Issue
Replies: 8
Views: 21882

Re: BA Issue

Cool!

Good to know they are now working well.
by chrisp
Tue Jun 22, 2010 10:52 pm
Forum: JLM Audio Kits
Topic: BA Issue
Replies: 8
Views: 21882

Re: BA Issue

That's what the instructions say - my BA boards pre-date this, so I've never done it, but yes, you need to physically cut the pcb where indicated by that small horizontal yellow line to break the trace (when I've had to do this for other projects, I have used a sharp, small bladed knife or a very sm...
by chrisp
Tue Jun 22, 2010 6:59 pm
Forum: JLM Audio Kits
Topic: BA Issue
Replies: 8
Views: 21882

Re: BA Issue

Are you saying you have not implemented any part of the "hum fix"? It addresses two issues - one relates to C16 (an electro DC blocker, hence "hum" fix) where you cut a trace and put a link to 0V, but the other is to mount the transformer's load capacitor (CL) on the underside of the PCB. If you hav...
by chrisp
Tue Jun 08, 2010 9:36 am
Forum: JLM Audio Kits
Topic: VUPPMGR40v2 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD
Replies: 60
Views: 268743

Re: Coming Soon New 40 Led PPM/VU/GR Meter kit with Peak hold

Yep, horizontal in a 1U is fine if you like edgewise meters. You could easily stack 2 in a 1U case for stereo metering. But its really a question of design and function - metering is an important issue for sure, but front panel space is premium, and just because you can does not mean that you should...
by chrisp
Mon Jun 07, 2010 5:17 pm
Forum: JLM Audio Kits
Topic: VUPPMGR40v2 kit (40 Led PPM/VU/GR Meter kit) BUILD THREAD
Replies: 60
Views: 268743

Re: Coming Soon New 40 Led PPM/VU/GR Meter kit with Peak hold

Guys and gals, just remember that this thing is 3U high - its lovely and all that, but getting into a case with all your other stuff may be a design issue. Sorry, don't want to rain on the parade. The thing is that its range allows for a huge sensitivity. I can see it in mastering / mixing applicati...
by chrisp
Sun Jun 06, 2010 3:51 pm
Forum: JLM Audio Kits
Topic: Fun with Faceplates
Replies: 5
Views: 16318

Re: Fun with Faceplates

Well you've certainly got some flair for panel design - I always end up with a very severe utilitarian look. I think you've got a good look going there.
by chrisp
Mon May 31, 2010 5:45 pm
Forum: JLM Audio Kits
Topic: Soft Limit Circuit
Replies: 0
Views: 28729

Soft Limit Circuit

OK - I know Joe does this for the TMP8, but how is it done?

Is it a great big secret or can we little DIY people get in on the act? I'd like to add some to my BAD outputs.
by chrisp
Tue May 25, 2010 4:02 pm
Forum: JLM Audio Kits
Topic: Fun with Faceplates
Replies: 5
Views: 16318

Re: Fun with Faceplates

Muchos fun by the looks. Design looks funky, so well done on that. In fairness to Joe, I now make sure I do not use the JLM logo design in a way that might suggest that the product is fully JLM built. I have no issues with stating that something is "JLM", I just don't use his logo design. We out her...
by chrisp
Fri May 21, 2010 8:10 am
Forum: JLM Audio Kits
Topic: JLM and Chandler Germanium
Replies: 2
Views: 10701

Re: JLM and Chandler Germanium

Try the TG500
by chrisp
Sat May 15, 2010 8:01 am
Forum: JLM Audio Kits
Topic: MONO Ver1 Mic pre kit BUILD THREAD
Replies: 23
Views: 86046

Re: MONO Mic pre kit BUILD THREAD

It short, no. To nicely record a group that size, you need a microphone with an omni pattern, and good sensitivity, and that means a condenser microphone - but condensers need to be powered either from a preamp or from a battery, and a cassette dictaphone can't do that. You'll also need a special ca...
by chrisp
Sat Apr 24, 2010 9:53 pm
Forum: JLM Audio Kits
Topic: DINGO PCB and kit BUILD THREAD
Replies: 112
Views: 366853

Re: DINGO PCB and kit Now Available

Yes, Fig 3 is what my comments were aimed at as well. Just watch out where you are putting the gain control. You can't use the DINGO's normal gain, because that is structured as a non-inverting buffer, not as a virtual summing point. If you want gain in the virtual summing, its controlled by the res...