So, I've been looking at various methods of acheiving balanced line output.
The ones I found being used where 3
1) Use 2 opamps to do the job as in the gssl output circuit
2) Use an integrated Balanced Line Driver such as Analog Devises' SSM2142
3) Use a transformer
For my purposes, In an all discrete circuit I would not want to send the audio suddenly through a chip just to acheive balance. So that rules out contestant number 2 and 1 as well unless the opamps are descrete.
But using 2 DOA's just to balance a line seems like overkill.
For my purposes where I have to make quite a few of this circuit, I must also rule out contestant number 3, the transformer on account of price.
So what I am looking for is some simple transistor based circuit that has the abillity to receive an unbalanced signal and send out two signals out of fase with each other.
So I ask you wise people of this counsil: Could I somehow use a supermatched transistor pair or quads to acheive this in a way that it does'nt alter the signal to any great extent and would also have some drive for the line and keep it simple?
The prospects are:
SSM2210 - Audio Dual Matched NPN Transistor
MAT02 - Low Noise, Matched Dual Monolithic Transistor
MAT04 - Matched Monolithic Quad Transistor
LM394BH - You know the guy
And I read somewhere on the forum about matched npn/pnp pairs being available.
Does such a circuit exist or does anyone feel that it could easily be made?
hejsan
The ones I found being used where 3
1) Use 2 opamps to do the job as in the gssl output circuit
2) Use an integrated Balanced Line Driver such as Analog Devises' SSM2142
3) Use a transformer
For my purposes, In an all discrete circuit I would not want to send the audio suddenly through a chip just to acheive balance. So that rules out contestant number 2 and 1 as well unless the opamps are descrete.
But using 2 DOA's just to balance a line seems like overkill.
For my purposes where I have to make quite a few of this circuit, I must also rule out contestant number 3, the transformer on account of price.
So what I am looking for is some simple transistor based circuit that has the abillity to receive an unbalanced signal and send out two signals out of fase with each other.
So I ask you wise people of this counsil: Could I somehow use a supermatched transistor pair or quads to acheive this in a way that it does'nt alter the signal to any great extent and would also have some drive for the line and keep it simple?
The prospects are:
SSM2210 - Audio Dual Matched NPN Transistor
MAT02 - Low Noise, Matched Dual Monolithic Transistor
MAT04 - Matched Monolithic Quad Transistor
LM394BH - You know the guy
And I read somewhere on the forum about matched npn/pnp pairs being available.
Does such a circuit exist or does anyone feel that it could easily be made?
hejsan