I will just explain part of this circuit. D9 and D10 provide a low cost -1.4 from -5 V. This is needed to reach near 0.00 for LM317 Min. setting. An LED also can be used with proper bias. Note that there is a Temperature Coefficient in ppm, see The Unusual Diode FAQ. but it may not matter upto 8 bits accuracy. TIP2955 PDF, TIP3055 (NPN), TIP2955 (PNP) Complementary Silicon Power Transistors. It is a Darlington, that means good current gain. See Darlington transistor – Wikipedia. When current in R1 10E goes more than 50mA a voltage of 50mA X [Read More ....]
Circuits
Circuits and Schematics, pdf, png.
Schematics of delabs – Introduction Archive has been updated, errors and broken links checked, fifteen circuits were added. See also Soldermans Basics These are small circuit building blocks which may be useful in giving you some ideas. And help you learn more about circuit design and electronics engineering. Some are derived from application notes of chips, some are generic designs and some are my own innovations. They are designs that were used by me in the manufacture of various products many years ago. I have also tried to explain some circuits to the extent that i can understand or express. [Read More ....]
