Prev: The world has never seen such freezing heat
Next: NE612 mixer: input/output impedance in balanced mode?
From: sparks on 23 Nov 2008 18:11
Hi,
Could someone please clarify the input and output impedance
requirements when using the NE162 in a balanced configuration - that
is using a balanced transformer at the input (pins1&2) and output
(pins 4&5).
The datasheet mentions 1.5K impedance at each input and output
terminal, but does this mean a transformer would need to step up a 50
ohm unbalanced source to 3K ohms (balanced) to feed the two input
pins, and vice versa to step the output down to 50 ohms. Ive seen
circuits on the Net which imply the high impedance winding of both
transformers was 1.5K and another circuit that implies a 3K ohm centre
tapped winding where the CT goes to Vcc on the O/P transformer. All a
bit confusing...
thanks,
JEFF

 | 
Pages: 1
Prev: The world has never seen such freezing heat
Next: NE612 mixer: input/output impedance in balanced mode?