This video gives the basics of the bias point, also called operating or quiescent point, of a bipolar transistor (BJT). For a BJT, there are three operating regions: Cutoff, Active and Saturation
Monthly Archives: September 2014
Prototyping Board #2: Pictures
Prototyping Board 2: Arduino shield
This board is the number 2 in the “Permanent Breadboards” series. This time, the layout is no more a simple direct copy of a classic breadboard: it’s a mix between a stripboard and an Arduino shield!
The Prototyping Boards are designed to offer the same look and feel as classic breadboards, with the ability to solder connexions: yes, you will have to solder 🙂
In other words, you’ll keep your prototype for life time!
Continue reading Prototyping Board 2: Arduino shield
Here’s an excerpt from a topic about temperature compensators in exponential converters on Modwiggler forum:
Frequency drift is caused by the two transistors in the exponential converter being at different temperatures and minimised by them being on the same substrate. This is temperature balancing. Temperature compensation with tempco resistors tries to stop the Volts/oct changing by matching the exponential term which is proportional to absolute temperature. At 25 deg C the amount of change for 1 deg is 1/(273 + 25) = 0.33557% or 3355.7ppm. That is where the figure comes from, it is not 3300pmm or 3000ppm or 3500ppm or anything else.