Ccda Constant Current Draw Amplifier Back in september of 1998, i had posted at the glassware web site a circuit of the month article on the ccda circuit. ccda stands for constant current draw amplifier. the ccda consists of a grounded cathode amplifier directly cascading into a cathode follower. The constant current draw amplifier (ccda) (aka the apex "cathode follower") there is a lot of talk about the asian microphones and their "cathode follower" (cf) circuits. what usually follows in the blogs is the endless discussions about the merits of or the terrible sound of the cf circuit. but there is much more to this than is usually.
Ccda Constant Current Draw Amplifier The link to the constant current draw (ccda) preamp that i referenced in one of my earlier posts shows essentially that. using 30k resistors and the 1 to 1.5k resistor is a good choice too, i think, because it positions the quiescent point of both tubes at a reasonable 5ma current draw each, and about 5v grid relative to plate. My solution was to create a new pcb: the ccda mono noval. the pcb is cute, being only 3 inches by 5 inches big. the pcb holds one ccda (constant current draw amplifier) gain stage and one rc b voltage filter and two output coupling capacitors. the ccda mono noval is a mono design, so two will be needed for stereo. In case you forgot, ccda stands for constant current draw amplifier. the ccda is a compound circuit consisting of a grounded cathode amplifier input stage that dc connects to a cathode follower output stage. each triode sees the same cathode to plate voltage and the same load resistance and same idle current draw. A constant current draw amplifier with positive feedback instead of the usual cathode decouple cap to raise the amplification. it seems nearly everyone is using mr. fikus lampizator circuit, which again is an old circuit that i think mr. torsten loesch was one of the first to use for a tda1541 dac.
Ccda Constant Current Draw Amplifier In case you forgot, ccda stands for constant current draw amplifier. the ccda is a compound circuit consisting of a grounded cathode amplifier input stage that dc connects to a cathode follower output stage. each triode sees the same cathode to plate voltage and the same load resistance and same idle current draw. A constant current draw amplifier with positive feedback instead of the usual cathode decouple cap to raise the amplification. it seems nearly everyone is using mr. fikus lampizator circuit, which again is an old circuit that i think mr. torsten loesch was one of the first to use for a tda1541 dac. It is a ccda (constant current draw amplifier) with a tube rectified & regulated power supply. aside from a larger than expected voltage drop across the rectifier, the prototype works well enough. right now i'm battling with remote volume control considerations, which means fussing about with programming microcontrollers. According to john broskie in tube cad journal (ccda: constant current draw amplifier): both the grounded cathode amplifier and the cathode follower are in voltage phase, but not current phase. for example when the grounded cathode amplifier sees a positive going input signal, its plate current increases, which increases the voltage developed.
Ccda Constant Current Draw Amplifier It is a ccda (constant current draw amplifier) with a tube rectified & regulated power supply. aside from a larger than expected voltage drop across the rectifier, the prototype works well enough. right now i'm battling with remote volume control considerations, which means fussing about with programming microcontrollers. According to john broskie in tube cad journal (ccda: constant current draw amplifier): both the grounded cathode amplifier and the cathode follower are in voltage phase, but not current phase. for example when the grounded cathode amplifier sees a positive going input signal, its plate current increases, which increases the voltage developed.
Audiotronika User Guide Constant Current Draw Amplifier Ccda
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