spritzer
Member of the Trade: Mjölnir Audio
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- Aug 22, 2002
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Quote:
You'll only need a simple voltmeter capable of measuring 600v. You adjust the pot while measuring before the 5meg resistor to get 580v or slightly less. The 5meg resistor is there only to protect you if something in the headphones breaks and they short circuit so it can be of a 1/4w rating. This is an open circuit so very little current should pass through is under normal circumstances. The transformer isn't a necessity but it is very small and cheap and it adds a level of protection. Stax didn't use transformers in the adapters and they do not bust into flame.
Originally Posted by judo /img/forum/go_quote.gif Many thanks !!! It does not seem too complicated only getting the 5 Mega and measuring the result problematic, I think - I have only a cheepo meter. Perhaps with a similar transformer connecting series the primaries. Would be the Stax solution similarly easy ? |
You'll only need a simple voltmeter capable of measuring 600v. You adjust the pot while measuring before the 5meg resistor to get 580v or slightly less. The 5meg resistor is there only to protect you if something in the headphones breaks and they short circuit so it can be of a 1/4w rating. This is an open circuit so very little current should pass through is under normal circumstances. The transformer isn't a necessity but it is very small and cheap and it adds a level of protection. Stax didn't use transformers in the adapters and they do not bust into flame.