![]() ![]() ![]() With the load current effectively zero, \$R_2\$ and \$R_4\$ act as an uncontrolled (but small) collector bypass current that pulls up on \$Q_1\$'s collector enough to likely yield an almost zero \$^\$ and it is now that we need to focus much more closely on precisely when the foldback might happen.īut even after the change-over, when the current direction in \$R_2\$ has reversed, \$Q_1\$ is still heavily saturated (in a properly designed circuit.) \$Q_2\$'s collector hasn't yet replaced enough of it to push \$Q_1\$ out of saturation. Consulta la traduccin alemn-espaol de Foldback-Klammer en el diccionario en lnea PONS Entrenador de vocabulario, tablas de conjugacin, opcin audio. \$Q_1\$'s base-emitter junction is mostly just a diode junction here. Prices and ratings for 'Foldback-Klammer' compare products and find the best offers on Switzerland’s largest price comparison Toppreise.ch. \$Q_1\$ is fully saturated and the current in \$R_1\$ is almost the same as the current in \$R_3\$. Simulate this circuit – Schematic created using CircuitLab Zu dieser Zeit war es blich, das Papier mit zwei Lochern zu stanzen und die einzelnen Bltter zusammenzunhen. ![]() I've used a small green arrow to point out this detail: if you carefully look, you can see that the direction through \$R_2\$ is diametrically opposite in these two cases. Was sind mauly Klemmer Ursprnglich wurde die Foldback Klammer im Jahre 1910 von dem Amerikaner Louis E. Diagram 2 shows the arrangement where the load current is moving sufficiently towards foldback that \$R_2\$ is now supplementing \$Q_2\$'s base current (along with current through \$R_4\$) and foldback is near. Diagram 1 shows the arrangement where the load current hasn't yet risen to the point where \$Q_2\$'s collector current is significant and where the current in \$R_2\$ is pulling up on \$Q_2\$'s base, keeping it out of a foldback behavior. These diagrams are arranged so that you can focus on their operation during two different phases. I've drawn two versions of the same schematic below. ![]()
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