On 28/05/2018, dan pridgeon <d_pri...@yahoo.com> wrote: > I hope you will publish your circuit and its description soon. I'd like to > study it. (a .png would work if you have a sketch of it.) > Thanks. Dan. >
I am afraid there is nothing new to study. The input is fed to a differential pair powered by a constant current source using two resistors in series with a Zener diode connected from the midpoint between the resistors and ground (0 volt terminal). The output of the differential pair is from a resistor and the + terminal of the power supply. The output drives a PNP transistor with its collector connected to constant current source with the latter's current set at 13mA. This provides a very high impendance while at the same time it improves the circuit's behaviour when the output voltage approaches clamping voltages. A resistor as ouput would limit the ouput driver's current to voltage_difference / R. Since we are almost at clamping voltages, the voltage difference is small, so also the drive current. This condition is highly undesirable if distortion is to be minimized. The current passes through two diodes in series and an adjustible resistor which should provide the necessary driver stage bias voltages to minimize crossover distortion. _______________________________________________ Dng mailing list Dng@lists.dyne.org https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng
