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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

LDR Pre MkII - LDR volume control and I/O switching
LDR Pre MkII - LDR volume control and I/O switching
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Old 15th March 2020, 09:03 PM   #311
knarf68 is offline knarf68
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Join Date: Sep 2016
Hi ZDR, I'am testing my LDR Pre MKII at the moment. When I start-up the following message shows up:
Error 21: LSE Power Failure
The measured the LDR resisitance of LSE is 85 ohms. I can also set the BIAS to 700K without a problem. The three relays are activated (on).
Pleas advice, what could cause this error?
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Old 16th March 2020, 08:23 AM   #312
zdr is offline zdr  Belgium
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Check your solder joints and components values. Compare 4 LDR channels amongst each other.
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Old 21st March 2020, 01:04 PM   #313
knarf68 is offline knarf68
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Thanks for the directions, I found a bad solder joint at one of the relais. The unit is calibrated and 100% functional. Now it is time to test
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Old 26th March 2020, 06:48 PM   #314
knarf68 is offline knarf68
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just to let you know, the LDR project works great. I'am very satisfied with the sound and functionality.
One question though, how can I add on/off functionality? Somewhere I have read that a second encoder could be used. Could someone explain how this works?
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Old 27th March 2020, 10:25 PM   #315
zdr is offline zdr  Belgium
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Quote:
Originally Posted by knarf68 View Post
just to let you know, the LDR project works great. I'am very satisfied with the sound and functionality.
One question though, how can I add on/off functionality? Somewhere I have read that a second encoder could be used. Could someone explain how this works?
Yes, second encoder can be used. You also have standby function (on/off) on the remote, invoked when you press and hold play button.

There is no connector for second encoder on board, so you need to solder wires directly to arduino in order to connect it:

pin 13 - to encoder button
pin 11 - to encoder CCW
pin 12 - to encoder CW
gnd - to encoder gnd
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