Hi All!
Simulations are great!!, everything works as expected.... in theory... : But when it comes to build it... problems arise...
I have build the D. self, superbal diff input to use it as a mixamp (fixed gain), with four 10k summing resistors, 22k feedback resistors and 2k2 in the servo. a 100R(not shown) and a 47k to gnd in the output and got sound.... sounds good until i realize that the SSM2142 that feeds the balanced summing network, only feeds 2 of the 4 resistors of the summing network. I try with 8 summing resistors, and displaced the wires comming from the outputs of the line driver, to assure i really feed the lower summing resistors. Et voilà! ¡¡silence!! Something in the circuit cancels the signal...
Attached are schematics of what i build...
If anyone can spot the mistake/s.....
Thank you for your help!
Jay x
Simulations are great!!, everything works as expected.... in theory... : But when it comes to build it... problems arise...
I have build the D. self, superbal diff input to use it as a mixamp (fixed gain), with four 10k summing resistors, 22k feedback resistors and 2k2 in the servo. a 100R(not shown) and a 47k to gnd in the output and got sound.... sounds good until i realize that the SSM2142 that feeds the balanced summing network, only feeds 2 of the 4 resistors of the summing network. I try with 8 summing resistors, and displaced the wires comming from the outputs of the line driver, to assure i really feed the lower summing resistors. Et voilà! ¡¡silence!! Something in the circuit cancels the signal...
Attached are schematics of what i build...
If anyone can spot the mistake/s.....
Thank you for your help!
Jay x