Hook-Up
Thanks for the suggestions!
A couple of follow-ups:
1. If you run power directly to the output boards, what pads does it go to?
2. What is the purpose of the feedback from the positive speaker post to the FB point on the driver boards?
3. In your output board picture (Al), what are the purple and blue wires for, and where do they go to? Are these the D+ (or D-) connections to the driver boards?
K-Amps,
The case in my photo is a custom size from Par-Metals....I can look up the order number if you are interested. The sinks I got from a guy on ebay who salvaged them from some micro-wave amplifiers.
Thanks for the suggestions!
A couple of follow-ups:
1. If you run power directly to the output boards, what pads does it go to?
2. What is the purpose of the feedback from the positive speaker post to the FB point on the driver boards?
3. In your output board picture (Al), what are the purple and blue wires for, and where do they go to? Are these the D+ (or D-) connections to the driver boards?
K-Amps,
The case in my photo is a custom size from Par-Metals....I can look up the order number if you are interested. The sinks I got from a guy on ebay who salvaged them from some micro-wave amplifiers.
Troy,
Thanks for all your work on the kits. I haven't received mine yet but I just wanted you to know that I would be happy to cover any of your out of pocket expenses above what I paid. I am sure that others feel the same way. Please let us know and I'll be happy to paypal my share right over.
Philip
Thanks for all your work on the kits. I haven't received mine yet but I just wanted you to know that I would be happy to cover any of your out of pocket expenses above what I paid. I am sure that others feel the same way. Please let us know and I'll be happy to paypal my share right over.
Philip
RJK
You must know what the BCE of whatever output tranny your using
Example
21194 is a NPN with C to your + rail and E to + spkr. post
21193 is a PNP with C to your - rail and E to + spkr. post
3281A is a NPN #1pin=B #2=C #3=E
1302A is a PNP ditto
Go to Delta Audio and look at the schematic and study it for awhile, and it should come into focus
The + spkr output - both Emitters,feedback, and + spk terminal all tie together with FB going to the tie point on the board
If your feedback wire is close to any stray currents or long, you might use a shielded wire with the ground shield grounded at one end only and the other end open
Someone correct me if I made an error
David
You must know what the BCE of whatever output tranny your using
Example
21194 is a NPN with C to your + rail and E to + spkr. post
21193 is a PNP with C to your - rail and E to + spkr. post
3281A is a NPN #1pin=B #2=C #3=E
1302A is a PNP ditto
Go to Delta Audio and look at the schematic and study it for awhile, and it should come into focus
The + spkr output - both Emitters,feedback, and + spk terminal all tie together with FB going to the tie point on the board
If your feedback wire is close to any stray currents or long, you might use a shielded wire with the ground shield grounded at one end only and the other end open
Someone correct me if I made an error
David
googler said:s this a preview of the "newbie how-to page"?
Sort of, only hopefully with in focus pics!
RJK;
1) The power connections go to the big copper plane, as indicated below, positive to the Drive+ board, negaitve to the Drive- board.
2) The feedback connection acts as a control loop, to get the input and output matching as close as possible. A more technical explanation would take quite a long post...
3) Blue and purple are indeed the driver wires.
David's suggestions are spot on, if you look at the schematic it will all make sense, (hopefully!
).Attachments
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Par Metal
ParMetal gave it a part number of '16-19167BPM-Body 14" Wide'. It has a 1/8" anodized front and painted steel chassis. I actually sent them a copy of their catalog page with my desired dimensions superimposed on it....they came up with the model number.
The cost was $125.00 plus shipping with a couple of other smaller cases I ordered. For an anodized aluminum chassis instead of painted steel, they quoted me an additional $25.00.
Thanks Al, David, and everyone else for your help with the wiring details. As I said, my training is not in electronics, but I really enjoy it.
Robert
The case I ordered from Par Metal is a custom size to allow for 2 1/2" sinks on each side. The faceplate is 19" x 7". The chassis is 16" deep x 14"wide x 7" tall.K-amps said:Robert,
Where did you get that chassis/ sinks? Very NICE.
K-
ParMetal gave it a part number of '16-19167BPM-Body 14" Wide'. It has a 1/8" anodized front and painted steel chassis. I actually sent them a copy of their catalog page with my desired dimensions superimposed on it....they came up with the model number.
The cost was $125.00 plus shipping with a couple of other smaller cases I ordered. For an anodized aluminum chassis instead of painted steel, they quoted me an additional $25.00.
Thanks Al, David, and everyone else for your help with the wiring details. As I said, my training is not in electronics, but I really enjoy it.
Robert
An externally hosted image should be here but it was not working when we last tested it.
Got my transformer!
I just bought a 2KVA transformer with 4x28V secondaries from audiohobby.com for $85.
I am considering using this as single supply for both channels, but am also wanting monoblocks for more passive heatsink surface area. I've seen a few commercial systems where the power supply was in a separate box (i.e. Linn). Just wondering, how long can the cord from the PSU to the boards be before bad things (if any) happen?
Thanks,
Brad
I just bought a 2KVA transformer with 4x28V secondaries from audiohobby.com for $85.
I am considering using this as single supply for both channels, but am also wanting monoblocks for more passive heatsink surface area. I've seen a few commercial systems where the power supply was in a separate box (i.e. Linn). Just wondering, how long can the cord from the PSU to the boards be before bad things (if any) happen?
Thanks,
Brad
K-amps said:Yeah! Consider the cable as the "R" in your CRC design.
The secondary idle current is a little hot (29.6V), would any losses be negligable over say a 1 meter run from the transformer/caps to the main/driver/output boards?
How much of a difference would it make to have the PSU boards in the monoblocks vs in the transformer box?
~Brad