talk funny on board - new bus board for microprocessors

1-30 — elektor january 1980 talk funny on board 6a. Output "b" is again connected to all ten inputs "b" on the filter unit boards. The outputs of all filter boards (point "c" in figures 3, 4 and 5) are all connected to input "c" in figure 6c: the input of the summing amplifier. The first stage (A35, an LM301) is followed by an output level control (P15) and an out- put buffer stage (A36). A TDA1034 is used for this final stage, for the same reasons given earlier (low noise and high output drive capability). The nominal (line) output level of the vocoder is approximately 700 mV; the output impedance is very low (a few ohms) due to the negative feedback: the effect of R134 is cancelled (this resistor is included for stability and short-circuit protection). What"s to come? The power supply circuit, printed circuit boards and parts lists are still outstanding. Then, of course, construc- tional details and calibration procedure. Quite a lot, all told, but we hope to squeeze it all in...