Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Does ES6 make JavaScript frameworks obsolete? Podcast Do polyglots have an edge when it comes to mastering programming Featured on Meta.
Now live: A fully responsive profile. Linked Related 1. Hot Network Questions. KG - All rights reserved. Turck Worldwide. Product Comparison Please select up to 4 products for comparision. Maximum of products for comparison has been reached. This forward-biases the base-emitter diode, which exhibits the characteristic 0. The breakover voltage of this diode is the VCE parameter listed on the spec sheet, and varies from one transistor type to another. The current through the collector-emitter path is controlled by the current flowing through the base-emitter junction.
The amount of influence is called the gain of the transistor, or hFE. Substituting a PNP in the circuit reverses the current flow through the base-emitter diode and the voltage on the collector.
Bottom line, most small-signal amplifiers will work equally well if you replace an NPN with a PNP and reverse the power supply polarity. And that means if you have mixed sexes, each and every transistor has to have a sex change. Remember that all the transistors in the circuit should be changed with theyr complementary, so if you have PNP's and NPN's in your circuit there's no way out, you need both types of transistors. If it's the only type of transistor in the circuit, the translation is straightforward; build the circuit as designed, reverse the power connections and any other polarised components diodes, electrolytic caps.
Peter Walker did this around for the Quad power amp I believe 3 transistors were involved when there was no PNP version of the famous 2N
0コメント