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Total 5 documents matching your query.

1. [TenTec] Rsc value for LM723 in 280/255 power supplies? (score: 1): Author: Peter Bertini <radioconnection@gmail.com>; Date: Sat, 2 Jun 2012 13:07:23 -0400; Hello to the group I'm in the processing of rescuing a much abused TenTec 280 power supply. There is no amp meter on the front, but it has the speaker, so I assume it may be a model 255 despite what; /archives//html/TenTec/2012-06/msg00016.html (7,384 bytes)
2. Re: [TenTec] Rsc value for LM723 in 280/255 power supplies? (score: 1): Author: Clayton Brantley <clayton_n4ev@yahoo.com>; Date: Sat, 2 Jun 2012 12:19:48 -0700 (PDT); Sounds like the "normal" way for a '723 supply to die. I would keep the power transformer IF it's ok, then build a supply using the 7815 regulator controlling the base of a darlington pair. K4EAJ; /archives//html/TenTec/2012-06/msg00018.html (9,543 bytes)
3. Re: [TenTec] Rsc value for LM723 in 280/255 power supplies? (score: 1): Author: Mike Bryce <prosolar@sssnet.com>; Date: Sat, 2 Jun 2012 15:38:39 -0400; pete, the .68 ohm resistor does NOT set the current for the supply. That's done by the four .15 resistors mounted on the pass transistor PCB. the resistor monitors base current to the 2n5301 transist; /archives//html/TenTec/2012-06/msg00020.html (10,906 bytes)
4. Re: [TenTec] Rsc value for LM723 in 280/255 power supplies? (score: 1): Author: Peter Bertini <radioconnection@gmail.com>; Date: Sat, 2 Jun 2012 17:07:48 -0400; I hope I am replying to the current thread correctly; since I don't see a reply feature when reading the archives. I'm not concerned about the damage, I am rebuilding the supply with all new parts in; /archives//html/TenTec/2012-06/msg00021.html (8,168 bytes)
5. Re: [TenTec] Rsc value for LM723 in 280/255 power supplies? (score: 1): Author: Mike Bryce <prosolar@sssnet.com>; Date: Sun, 3 Jun 2012 13:58:43 -0400; pete, the .68 ohm resistor does in fact monitor current, but not the total current from the supply. the value is not critical in this application. I've used various low ohm resistors with no adverse; /archives//html/TenTec/2012-06/msg00023.html (10,177 bytes)

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