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audioguru said:The link you posted has a different circuit for a hybrid transformer:
This is NOT a hybrid!pooh2006 said:but somethin' like this circuit (it's not my design) can be called a hybrid circuit (as it simulate the transformer ??), because i tested it and i have got a good quality (but for sure the mic handle a mixed signal) with a loop current for about 15mA (the resistance of phone == 500ohm).
pooh2006 said:i found this circuit before on **broken link removed** through google, and i think it have somethin' wrong coz after analyzing the op-amp subtraction circuit i found that it subtracts the hole mixed signal from the transmitter signal (or may be i'm wrong !), and also i'll require a dual op-amp ic beside the transformer in circuit which is not good for my desired circuit, anyway thanks.
ljcox said:This is a hybrid.
T2 is the hybrid. It is essentially a Wheatstone Bridge.
IF Zl matches the line impedence, there is infinite loss (in theory) between the Mic & Speaker.
The loss from line to Mic is about 3 dB, and the same from the Speaker to line.