DINGO PCB and kit BUILD THREAD

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themaproom
Posts: 4
Joined: Fri Jun 16, 2017 1:43 am

Re: DINGO PCB and kit BUILD THREAD

Post by themaproom »

Hi,

I'm planning on using 2 DINGO to make a mastering box with gain of +/- 5dB (switchable in .5dB steps with elma A4 series switches). Is the best place to implement a gain control like this in between the input stage and the output stage? I think that would mean I would set the overall gain for +11dB and then this would be a switchable attenuator? I'll try to make or find a calculator to determine my resistor values, but any suggestions on approx what the higher R value should be to help keep noise down? 1K? 10K?

Thanks,
Josh

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Joe Malone
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Re: DINGO PCB and kit BUILD THREAD

Post by Joe Malone »

themaproom wrote:
Sun Oct 25, 2020 2:04 pm
Hi,

I'm planning on using 2 DINGO to make a mastering box with gain of +/- 5dB (switchable in .5dB steps with elma A4 series switches). Is the best place to implement a gain control like this in between the input stage and the output stage? I think that would mean I would set the overall gain for +11dB and then this would be a switchable attenuator? I'll try to make or find a calculator to determine my resistor values, but any suggestions on approx what the higher R value should be to help keep noise down? 1K? 10K?

Thanks,
Josh
HI Josh
Yes that will work fine. Keep the pot / switch resistive string as low in ohms as the first stage opamp can drive properly which is usually like 1k log for good opamps. If doing switched steps you will usually need a shorting type switch to stop pops between switching steps.
Joe :-)
JLM Audio
Capturing Audio without Injury

slb1959
Posts: 11
Joined: Fri Mar 02, 2012 11:11 am

Re: DINGO PCB and kit BUILD THREAD

Post by slb1959 »

Hi Joe.

Do you have some equalizer or some tone control, to connect between Dingo and lm3886 amp?

Thanks

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Joe Malone
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Re: DINGO PCB and kit BUILD THREAD

Post by Joe Malone »

slb1959 wrote:
Wed Nov 03, 2021 9:31 am
Hi Joe.

Do you have some equalizer or some tone control, to connect between Dingo and lm3886 amp?

Thanks
HI Only our 500 series PEQ500 and FREQ500 modules. We do not have anything else kit wise
Joe :-)
JLM Audio
Capturing Audio without Injury

slb1959
Posts: 11
Joined: Fri Mar 02, 2012 11:11 am

Re: DINGO PCB and kit BUILD THREAD

Post by slb1959 »

Hi Joe.
Thanks.
Do you have any interface for the IDC 10 pin connector?
Or, how can i turn on/off the relay?

Many thanks

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Joe Malone
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Re: DINGO PCB and kit BUILD THREAD

Post by Joe Malone »

slb1959 wrote:
Tue Nov 09, 2021 9:03 am
Hi Joe.
Thanks.
Do you have any interface for the IDC 10 pin connector?
Or, how can i turn on/off the relay?

Many thanks
To operate the hard bypass relay to switch to dingo output. Connect IDC pin 3 to either 0v directly or to -V with series 2k7 resistor if using +/-24v power rails.

If using lower power rails always go to -V rail with a smaller value series resistor using the calc example here +/-15v = 30v. R = (30v-24v)/0.01 = 600ohm so 560R or 620R would be fine.
Joe :-)
JLM Audio
Capturing Audio without Injury

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