analogsurviver
Headphoneus Supremus
- Joined
- Jul 2, 2012
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Thank you for the useful information. I checked the schematics on the internet and I've only seen some high voltage capacitors, no batteries. I presume these are the 'biasing voltage keepers' those must be kept 'charged' with the audio signal.
It was only Stax that produced SB transformers - even for speakers ( I wouldn't like to see the bill for battery replacement - some 3 thousand button cells per chanell ).
This is if we are talking about true electrostatics, which require polarizing voltage to be supplied by the power supply.
If it is electret, which means permanently charged, then you do not need any power supply. Schematics for the two can be completely equal ( if electret is also push-pull design ), the only difference being power supply - or the lack of it.
There is no such thing as charging by the audio signal - or at least there should be none.