What's wrong with my circuit? Answered
I have built this ne556 timer inverter with a few changes, R1 is now 470 ohm, R2 is now 3.3k ohm with a 10k pot, C1 is now a 470pF, and the Darlington transistors are now 2n3055s.
I attached my multimeter to the circuit to measure frequency it should range from 150kHz to 450kHz with the 10k pot. While the pot was at zero (I think) the frequency was about 450kHz but when I started adjusting the pot the frequency went up to 1.1MHz, Why could this happening and how can I fix it?
Also the 2n3055 on pin 9 was getting a lot hotter than the other despite their near exact conditions, why is this happening?
I noticed when adjusting the pot that the frequency does drop to 360kHz then shoots up to 1.1MHz.