![]() ![]() Replacing transistors, swapping two wires (I made them a bit thicker on the diagram above) and rotating C6 is all there is to it. I organized it so the changes are minimal and clear. Phototransistors come in NPN and PNP varieties. figure for this Silicon Germanium integrated-circuit low-noise amplifier. Here’s an example of breadboarded circuits: Fuzz Faces, NPN & PNP side by side on a breadboard When there is sufficient light to the base of the transistor, current conducts across the emitter-collector terminal. Silicon Germanium (SiGe) bipolar transistors exhibit high gain and low noise. C2 has to be reversed (note that positive lead is at 9V), but C1 should be left as is – because polarity for it did not change. And this is important because if we don’t wire up electrolytic capacitors correctly – they might be damaged or destroyed (and in extreme cases they could explode or catch fire). The only difference is that C2 has to be rotated, because polarity changed. The power rails for the amplifier part are swapped, as well, but that the same as when I tried out LPB-1 in PNP version. These are high gain transistors, if you used lower gain transistor for NPN version, and you like that sound maybe look for a lower gain PNP alternative. BC559C is PNP complement to BC549C that I tried out before. 1 is a schematic circuit diagram of an exemplary embodiment of the invention. It is clear that I have to replace transistors – I went from BC109C NPN transistor to BC559C PNP transistor. direct-coupled amplifier circuit comprising a silicon transistor input. Here are the differences highlighted: Fuzz Face – NPN & PNP version: differences Here are side by side NPN and PNP version of the effect: Fuzz Face – NPN and PNP versions – side by side (click for full size image) Spot the DifferencesĪs with LPB-1 conversion, the diagram layout is practically the same. The schematic here is slightly adapted so it is easier to see/explain the differences. Schematic is the same that I did earlier, if you want to know more about the circuit be sure to have a look at the build page for the effect, or you can jump straight into more detailed look at it. I go through schematic and some extra details here, but if you prefer just seeing the video – go straight to it. I’ll breadboard a Fuzz Face clone, and then I’ll swap NPN transistors with PNP transistors. The silicon can be classified as an n-type semiconductor - electrons flow out of it - or a. I did a post on how to modify circuit from using NPN to using PNP transistors, and as a bonus I added a quick note on how to do this for Fuzz Face. On its own, a transistor has only one circuit element.
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