The HP 8903A "Pontis" Floating Cross-Coupled Output
Posted: Tue Apr 11, 2017 3:03 pm
Around 1980 HP introduced the 8903A Audio Analyzer featuring an active "floating" cross-coupled output.
The Pontis output was the pre-cursor of the SSM2142 and DRV134.
The HP8903 Floating "Pontis" Output
Complete output stage of the HP8903A with attenuator: https://www.proaudiodesignforum.com/ima ... _Tiled.jpg
HP8903A Service Manual: https://www.proaudiodesignforum.com/ima ... ervice.pdf (21 mb)
The "Pontis" output was published in the August 1980 HP Journal
(I think U2's inputs are mis-drawn....)
G.D. Pontis, "Floating A Source Output," HP Journal, August 1980.
August 1980 HP Journal: https://www.ka-electronics.com/images/p ... df#page=12 (pdf 7.7 MB)
Related reading:
"Balanced Outputs" https://www.proaudiodesignforum.com/for ... ?f=6&t=635
The Pontis output was the pre-cursor of the SSM2142 and DRV134.
The HP8903 Floating "Pontis" Output
Complete output stage of the HP8903A with attenuator: https://www.proaudiodesignforum.com/ima ... _Tiled.jpg
HP8903A Service Manual: https://www.proaudiodesignforum.com/ima ... ervice.pdf (21 mb)
The "Pontis" output was published in the August 1980 HP Journal
(I think U2's inputs are mis-drawn....)
G.D. Pontis, "Floating A Source Output," HP Journal, August 1980.
August 1980 HP Journal: https://www.ka-electronics.com/images/p ... df#page=12 (pdf 7.7 MB)
Related reading:
"Balanced Outputs" https://www.proaudiodesignforum.com/for ... ?f=6&t=635