Hi there, https://http://www.keil.com/mcb2140/mcb2140-schematics.pdf Does anybody know the reason and purpose for placing diodes D3 and D4 between the BJTs and ground? The schematic can be found at the url above. My electronics is rather poor so thanks guys for explaining it to me :) Cheers, Dexton
Your assumption is wrong. A diode has about 0.7Volts. So the negativ volatage on the basis will be just -0.7V. This is really basic knowlegde. So keep searching for an introduction to electronics. Reinhard