Solid State Guitar Amp Forum | DIY Guitar Amplifiers

Solid State Amplifiers => The Newcomer's Forum => Topic started by: saturated on September 27, 2025, 02:01:08 AM

Title: Too much base ?
Post by: saturated on September 27, 2025, 02:01:08 AM
I wanted to set up a circuit and see what happens.

Previously I was trying to do something different and after gathering a few components my calculations showed a voltage drop across the collector resistor of 23.9 when Vcc was 24 volts  :grr

So today I wanted to put together a circuit with a lower base resistor and see 🙈 if it would melt or blow up the transistor I had no idea what it would do.

Here is the schematic

IMG_20250927_003005623 (1).jpg

So I put it together and dialed up the voltage and kept watching for smoke but really nothing bad happened (I don't think)  :loco

Also I measured emitter current

IMG_20250927_002925935 (1).jpg

And here are my results

IMG_20250927_003743405 (1).jpg

One thing I am noticing is the lower beta value seems iirc in all the book experiments i did beta was about 170  xP

Seems like the base emitter voltage drop looks good so maybe I was nowhere near Chernobyl territory idk and that wasn't what I was trying to do.  I tried to feel if the transistor was getting warm/hot but it's tiny and I couldn't really tell.

My main interest was with the suspected huge voltage drop across the collector how much was gonna be left for the emitter resistor  :grr