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Old 17th April 2018, 02:43 PM   #21
binspaul is offline binspaul  India
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Location: Cochin, Kerala, India
Bugle power supply
Quote:
Originally Posted by JMFahey View Post
Dear binspaul, you are incredibly inconsistent in the data you supply, itīs IMPOSSIBLE to answer if you keep changing things all the time.

1) up to post#12, we were talking a +/-15V supply, fed from a 18+18V transformer (originally), switched to 15+15V in post #12 .
Then without explanation you switch from +/-15V rails to +/-24V
That alone invalidates all earlier calculations and answers

Even worse: by rising regulator voltage (24V) and lowering transformer voltage (15VAC means meager 21V peak/raw rail voltage) makes their work IMPOSSIBLE.
Do you realize that?


Hey, earlier you said it was
PLEASE decide on one value and stick to it.


Then you have a shorted preamp.

If the amplifier shorts and burns the Power Supply then you DO have an issue with the Amplifier.
Hello,

I am extremely sorry for the confusion created. The thread was started to discuss the Hagerman Bugle Power Supply for using in a phono pre amplifier project. After the few posts and discussions, the transformer required was confirmed to 15-0-15 center tapped.

Instead of creating a new thread, I used the same thread to discuss on using the Bugle power supply board to power the Pass B1 Buffer preamplifier. As I am having extra Bugle power supply boards and components, I was planning to use the same to power the B1 project (if possible).

1. Since B1 requires a higher input voltage, I switched the transformer to 18-0-18.
2. The resistor value is 10R @ 500mW (sorry for the typing mistake)
3. I am also assuming that there seems a shorting in the amplifier board which I need to find out.
4. Will there be a short if I reverse the JFET's?
5. I am using the original B1 buffer preamplifier and is only using the POSITIVE and GND from the bugle power supply. The NEGATIVE section is unused.

---
Best regards,
BP
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Old 23rd April 2018, 09:54 AM   #22
binspaul is offline binspaul  India
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Bugle power supply
Hi,

I was finally able to find the cause for the 10R getting blown out. It was due to an active short in the preamplifier board and the board was drawing too much of current when powered on. The 10R was not able to handle the demand and was getting blown out.

Best regards,
BP
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