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Old 9th February 2020, 03:41 AM   #291
shaan is offline shaan  India
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GB Update:

Mor7040 - 1 PCB
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Old 10th March 2020, 07:12 PM   #292
Rick G is offline Rick G  United States
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Old 29th April 2020, 10:42 PM   #293
Greg1017 is offline Greg1017  United States
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Old 23rd July 2020, 05:51 PM   #294
blek stena is offline blek stena  Croatia
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Old 25th July 2020, 11:36 AM   #295
outtek is offline outtek
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Hi Shaan, just a small question, if the board doesnt see AC it will not power up the relays? I am asking because I have populated the board except the rectifier diodes and I was feeding the board from a separate bridge rectifier. Would that be a normal behaviour?
Thanks, Florin
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Old 25th July 2020, 11:52 AM   #296
shaan is offline shaan  India
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Hi Outtek.

The relays will not trigger if AC is not present on board. You can get around this problem easily.

There is one diode between R5 and R7 on the left, and one between R6 and R8 on the right. Connect one of the AC outputs from the transformer to the anode of the left side's diode, and to the cathode of the right side's diode. Take care not to create solder bridges as these diodes are closely placed with the resistors.

Or,

If there are no power rectifiers present on board, connect the AC outputs to anode of D1 Rectifier, and cathode of D2 Rectifier.

In either case, use 1Kohm 0.25W resistors in series with the AC connections. The resistors should be as close to the transformer's AC outputs as possible to prevent any chance of a short connection between the AC output and other nodes.

Last edited by shaan; 25th July 2020 at 11:54 AM.
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Old 1st August 2020, 02:24 PM   #297
outtek is offline outtek
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Hi Shaan, managed to get the board done but when the relays engage it does it like in a vibrating/oscillating way not a swift switch as one would expect, the two resistors calculated for 56v ( 12v relay wit 220 ohm coill, I ended up with a 390ohm resistor this way )get very hot, the voltage across the coil is 12.6v, I do not believe that is normal. Is there an issue with my build?

Thanks, Florin
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Old 1st August 2020, 02:38 PM   #298
shaan is offline shaan  India
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Hi Florin.

Replace the 10uF polarized electrolytic capacitors (c7,c8) with 22uF.

Replace the 390 ohm with two 470ohm in series on each side (940ohm total on each side).
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