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Old 7th October 2009, 02:06 AM   #211
Salas is offline Salas  Greece
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All that sounds well done up to now. See with the Ohm meter if you have about 180R from the 300R combo resistor's left side to left pin of BC546 above them.
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Old 7th October 2009, 02:07 AM   #212
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Quote:
Originally Posted by udailey View Post
The two 600R resistors measure 300 since they are in parallel. The other two the resistance is printed on them 10k and 47k but both measure a very dynamic resistance in circuit. They start low and raise up in resistance. The 47k makes it to 47k and the 10k makes it to a little bit over 7k.
Both are BC546 from Fairchild.
Uriah
The two resistor one side nearer to 7812 output is measuring 11.9V - what is the voltage on the otherside - from ground - it should be around 5V if things are working all right?
What is the voltage across the relay coils ?
these measurements should point to any problems that you may have - also measure the voltage on those two transistors
If there is no proper voltage on the relay coils it will not energize
kannan
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Old 7th October 2009, 02:32 AM   #213
Salas is offline Salas  Greece
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Quote:
Originally Posted by udailey View Post
http://picasaweb.google.com/udailey/...63782095010674

Here is a pic and then another a little bigger in the link. Same pic though.

Uriah
Question. Where is the mid wire from PTx on the phoenix connector? I can't locate it on the pic.
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Old 7th October 2009, 03:28 AM   #214
udailey is offline udailey  United States
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Yes, 180R from Parallel 600Rs to BC546.
BC546 are the ones you sent, thank you
LM7812 is Fairchild LM7812ACT
The 47k resistor has 11.91V on one side and 8.55 on the other. The 10k resistor has 11.91 on on side and 0 on the other. The Two 600R have 11.91 each side.
The voltage across the relay coil I measured by putting one lead on each side of the diode since it is easily accessible and is parallel to the coil. 0V on the diode.
The midwire, the black one, from the transformer goes to the middle inlet on the terminal block. One yellow wire on either side. So GND is in the right place.
Kannan did you want me to measure the two BC546? I think so. So I measured the leftmost pin on each one. 11.91 on the bottom one and the top goes up slowly to 8.55.
Uriah
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Old 7th October 2009, 03:35 AM   #215
Salas is offline Salas  Greece
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And the long gnd jumper is soldered in both sides? The way the inwards NPN goes up is OK, there is continuity to the relay and 180R is its spec coil Ohmic, then a dead BC546 speculation remains. Do you have any cbe npn to substitute? Just any. Can you read V also in the mid leg of the lower npn?
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Old 7th October 2009, 09:18 AM   #216
Ian444 is offline Ian444  Australia
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People asking about the BOM to order parts, the latest published one was here:

http://www.diyaudio.com/forums/group-buys/147075-gb-dc-coupled-b1-buffer-shunt-psus-post1915585.html

There may be some minor changes coming up but the bulk of it is there.
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Old 7th October 2009, 09:54 AM   #217
Ian444 is offline Ian444  Australia
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I added and edited some in the unofficial and unapproved building guide. I think that's about it for now. Hope it is helpful. Of course, Salas wrote most of it
Attached Files
File Type: txt SalasDCB1shuntreg build guide v3.txt (11.5 KB, 304 views)
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Old 7th October 2009, 11:25 AM   #218
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Quote:
Originally Posted by Ian444 View Post
People asking about the BOM to order parts, the latest published one was here:

http://www.diyaudio.com/forums/showthread.php?p=1915585

There may be some minor changes coming up but the bulk of it is there.
Korben69 should post the version 3.6 BOM to the other thread or here.
The 3p females are not correct. I have got Mouser to give me the correct one's and have given them to Korben69. I have ordered them myself to insure they fit. Another point is the 2 X 15v listed is preffered to be 2 X 12 50va.
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Old 7th October 2009, 12:34 PM   #219
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Quote:
Originally Posted by Ian444 View Post
I added and edited some in the unofficial and unapproved building guide. I think that's about it for now. Hope it is helpful. Of course, Salas wrote most of it
You can add this for builders

- use 7812 voltage regulator only even for 5V relay use and then use Resistors ( 2 x600 Ohms) to drop the Voltage down to 5V for relay coils.

Once powered check whether there is a click sound after 5-7 seconds delay on powering up. This indicates relay is working correctly. Measure Voltage across the Diode fitted across relay coil for knowing the voltage. If not something to be corrected on switch on delay circuit

Check all LEDs light up when powered ( if there is a fault some LEDS will not light up- my experience in building this)
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Old 7th October 2009, 12:41 PM   #220
Salas is offline Salas  Greece
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Or 2X300 if with a Mezmerize.

*Where is Uriah? Got unlucky. Needs some easy shot.
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