This question made me wonder. Say I want to drive a LED when a small level audio signal is present. I understand how to do this with an opamp, but how about a transistor. You'd have to bias it so that it just doesn't conduct without the signal, so that any extra voltage on the base will cause collector current to flow, right? Can anybody please explain how you do that: bias the transistor so that it just doesn't conduct, independent of temperature variations and such? Or is this the wrong approach?
Subscribe to:
Post Comments (Atom)
-
operational amplifier - What is the advantage of the inverting opamp circuit over non-inverting one?Op amp circuits are designed to achieve a specific gain regardless of the differences between individual op amps. One very common circuit ha...
-
Related question: Ceramic capacitors: how to read 3-digit markings? I have some ceramic capacitors with a 2-digit marking. How to read them?...
-
I'm having an issue with my Silicon Photomultiplier (SiPM) feedback circuit. The output is not behaving as expected. My board schematic ...
-
Can you please give me a definition, or at least a more specific context, of the term "point-of-load" converter/regulator? I have ...
-
My input is an FM carrier of 80.00MHz. It is FM modulated with 625kbpsec data. The deviation from carrier is about +/-700kHz. The data never...
-
My application has a small device, which draws about a watt, and is powered through a small dynamo, backed by a battery: The dynamo generate...
-
Looking at all the various schematics of op amps, regulators, etc. I see lots of multicollector or multiemitter BJTs (and why no multibase?)...
No comments:
Post a Comment