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KG Dynalo
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Old 24th June 2018, 11:40 PM   #1
skood is offline skood  Australia
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Join Date: Oct 2008
Default KG Dynalo

When I recased my Dynalo I accidentally reversed the polarity - fed -15v with +15 and +15 with -15.

The transistors (TC071cp) smoked. When I wired it correctly one transistor still smoked but all the leds came on. Is there anything else that could have been damaged apart from the 2 transistors?

Wondering whether it's worth repairing, if it's just the transistors (TC071cp) I guess it is.

Hoping someone with more knowledge than me will know what has been damaged..
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Old 25th June 2018, 08:22 AM   #2
edwtsui is offline edwtsui  Hong Kong
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I suggest to replace the damaged transistors first, then measure the voltages across different resistors according to the construction guide and check if something wrong.
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Old 25th June 2018, 08:23 AM   #3
edwtsui is offline edwtsui  Hong Kong
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FYI, you can download the construction guide here:

http://www.djgardner.com/headphone/g...Y%20Edits).doc
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Old 29th June 2018, 11:30 AM   #4
skood is offline skood  Australia
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Thank-you for this edwtsui, I replaced the transistors and seems to be ok now, will do some testing and checking to make sure.
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