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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 6th July 2019, 10:33 PM   #211
sabre66 is offline sabre66  Canada
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Could someone post a picture of the ps board from the rectifier side preferably one for 110VAC. I am not getting any voltage to my rectifiers but I've got voltage on my secondaries. I see other jumpers but cannot find any information on them.
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Old 7th July 2019, 05:45 AM   #212
zdr is offline zdr  Belgium
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You need to short jp1 and jp2, itís indicated in the BOM.
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Old 7th July 2019, 06:20 AM   #213
sabre66 is offline sabre66  Canada
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RTFM stupid me all is good now with power supply.
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Old 11th July 2019, 12:58 PM   #214
redjr is offline redjr  United States
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LDR Pre MkII - LDR volume control and I/O switching
On the PSU PCB, the 2 resistors are labeled 20k, yet the PS BOM calls out 10k. What is the correct value that should be used? Also, do the 7805s require heatsinks? Seems the silkscreen indicates those u-shaped HS are indicated.
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Old 11th July 2019, 04:41 PM   #215
zdr is offline zdr  Belgium
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10k is correct value. Heatsinks are not required.
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Old 12th July 2019, 12:52 AM   #216
sabre66 is offline sabre66  Canada
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Ok
I got my lcd 1309 version did the modifications to it, but on power up it does not light up. I've got 5.0 vdc at VCC and GND now where can the fault be? Where should I start looking?
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Old 12th July 2019, 03:54 AM   #217
sabre66 is offline sabre66  Canada
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I have continuity between sda and sdl from the arduino and the header. I tried to put 5vdc to red and black and still nothing. Should the BKL wire be hooked up somewhere?

Honestly I think the LCD is faulty I fully expect something to happen on the screen whether good or bad. I think I may just order the wide.hk one.

Also I notice if I power up the unit without the screen attached the lights on the arduino all light up for a few seconds then only the green stays on. With the screen attached only the green comes on.
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Old 12th July 2019, 05:35 AM   #218
zdr is offline zdr  Belgium
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Bkl shouldnít be wired anywhere. Display will remain black if there are errors anywhere. You should check all three power lines.
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Old 13th July 2019, 05:27 AM   #219
sabre66 is offline sabre66  Canada
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Ok a little troubleshooting on the oled
vcc to gnd 5.02 vdc
SDA to gnd 5.02 vdc -------sda pin to pin out 2.2k
SCL to gnd 5.02 vdc -------scl pin to pin out 2.2k

shouldn't the scl and sda be around 3.3 vdc?

I do notice that if the yellow and orange are hooked up to the oled no relays click and only the green light come on the arduino

without yellow and green TX and RX come on for a few seconds then go to green only and i hear a relay(s) click

Shorting the yellow and orange also produces a green arduino light only(no oled hooked up) hence my assumption that the oled is faulty.

I have taken the arduino reflashed and resoldered it back in and have also reflowed all other connections, still no good results.

I have ordered the wide.hk oleds with hopes that it is the OLED.

Last edited by sabre66; 13th July 2019 at 05:29 AM.
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Old 13th July 2019, 07:39 AM   #220
zdr is offline zdr  Belgium
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Scl and sda are pulled to vcc with 2k2 resistors so they should be around 5v. Make sure you modified oled without any errors. It seems that scl and sda are messing with i2c bus preventing arduino from booting.
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