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

The Kuartlotron - keantoken's simple error-correction superbuffer
The Kuartlotron - keantoken's simple error-correction superbuffer
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Old 28th February 2017, 11:43 PM   #811
lacro is offline lacro  United States
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Quote:
Originally Posted by Project16 View Post
I do not know the pcb that you use but it may have an engraved inductor and you forgot the link that is on the +10V.
I soldered the link for the inductor

Quote:
Originally Posted by keantoken View Post
Good point.

Sorry I haven't been able to help so far, I have been preoccupied with fixing Frankenstein, my car. It's a victim of a bad engine swap. The wrong distributor is bolted on backwards, among other things. I just finished replacing the head gasket and the oil pan, and now I have to figure out how to get the crank pulley bolt off to change the timing belt.
No problem Kean, I will eventually get this sorted out. I know what you mean about removing a crank pulley. I had to do that on a Honda Accord a long time ago, and it took a socket/breaker bar/ long pipe to loosen it. BTW/ some bolts are LH thread, and some are RH thread. I am sure you already know that.

Quote:
Originally Posted by brianco View Post
I have copied and cleaned-up a picture from an earlier post.

Examine the polarity of the four elcos on each board.
I have the caps installed with the correct polarity.




Now that I have the transistors off the board, is there a way I can check the output of the regulator if I power it, without damaging the Kuartlotron?

Photos of the board attached:
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File Type: jpg IMGP1052 (2).jpg (985.2 KB, 406 views)
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Old 1st March 2017, 12:02 AM   #812
keantoken is offline keantoken  United States
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It's a 92 honda civic LX, with the engine block swapped in from a 91. The cylinder head is from the 92. I just replaced the thermostat valve but it still runs too cool to turn on the radiator fan, and I know the radiator fan works all the way up the the thermoswitch which I just replaced as well.
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Old 1st March 2017, 12:44 AM   #813
keantoken is offline keantoken  United States
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With the transistors off the board you will not damage anything by powering it up.
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Old 1st March 2017, 12:35 PM   #814
Project16 is offline Project16  France
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It seems that this resistance has heated!
Have you checked that it is still good?

The Kuartlotron - keantoken's simple error-correction superbuffer-imgp1051-2-jpg
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Old 1st March 2017, 12:48 PM   #815
lacro is offline lacro  United States
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Yes - I swapped this resister, and both regs with the ones on the second board which is a working board. The resistor measures 68R, and it with the regs installed on the good board are working, but the known good parts from the working board exhibit the same problems when installed on the non working board.
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Old 1st March 2017, 12:57 PM   #816
Project16 is offline Project16  France
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Can be just a problem on the PCB, a cut off track or a bridge between two tracks!
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Old 1st March 2017, 12:59 PM   #817
lacro is offline lacro  United States
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Originally Posted by keantoken View Post
It's a 92 honda civic LX, with the engine block swapped in from a 91. The cylinder head is from the 92. I just replaced the thermostat valve but it still runs too cool to turn on the radiator fan, and I know the radiator fan works all the way up the the thermoswitch which I just replaced as well.
Man, I don't envy you if changing the timing belt on the Civic is similar to the Accord which I was quoted $1000 to do at dlr.. Luckily a friend helped me do it. It took a solid 8 hours, and used $200 in parts at wholesale prices. There were actually 2 belts, and 2 idlers on the accord. Also, found the water pump was leaking while in there. Not a fun day, but it ended well.
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Old 1st March 2017, 01:09 PM   #818
lacro is offline lacro  United States
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Originally Posted by Project16 View Post

Can be just a problem on the PCB, a cut off track or a bridge between two tracks!
I have inspected the board thoroughly with a high magnification eye loupe, and did't find any cut traces, or solder bridges.

I don't know if you read the whole thread, but it is possible that I reversed power ground with V- on the initial start up. I am not sure I did that, but it's possible.
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Old 1st March 2017, 03:09 PM   #819
keantoken is offline keantoken  United States
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It is possible that vias haven't connected between both sides of the board due to manufacturer defect, but this should not be a problem if both sides of the board are soldered to the lead.

At this point I would measure the resistance of all the resistors on-board. It looks to me by your transistor voltages that the Kuartlotron section is fine, and that the problem is in the regulator section.
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Old 1st March 2017, 03:20 PM   #820
Project16 is offline Project16  France
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It is possible that vias haven't connected between both sides of the board due to manufacturer defect, but this should not be a problem if both sides of the board are soldered to the lead.
I will be for this and especially on the track between the center of the inductance of the circuit and on the trimmer R1.
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