I only believe the book and I don't think 555 will do saw tooth output. Do math by book 1k + 90k/ 90K = 1.111% duty cycle. Check if its resistance is anywhere close to 1 Ohm (not in hundred’s range). However, given the ratings of 2N3055 is well above 5 Amp. Look at this circuit 555 #1 only, R1 =1K and R2 = 90K online calculator says 50% duty with 1uf cap. Since my 2N3055 Transistor was hanging on the wires without proper heatsink, I couldn’t test it with 5 amp current. I also need to connect output to small speaker to hear what it sounds like maybe if its not 50% duty cycle it still sounds good enough. I need to build prototype with variable resistors so I can see output on scope. They must also dissipate heat very quickly to avoid overheating. Such transistors must have low output resistance to deliver large load currents, and good junction insulation to resist high voltages. R1 + R2 has to be 2 times R2 to be 50% duty cycle according to the book. If a transistor designed to these concepts can handle more than 1 A of collector current, it is generally considered to be a power transistor. Online calculators must be wrong.? Once somewhere I read 555 will give saw tooth output but I am not seeing that in book or online.
#2n3055 transistor resistance check download
Check the other threads on the newer Toshiba and On Semi output transistors Download the datasheet for these newer devices and then compare to the datasheets for the TIP41/2 (Fairchild has a datasheet) Note the TIP41 costs 0.86 from Digi-Key the Toshiba devices 2.25. R2 = 90K this is 50% duty cycle according to online calculator but book math says NO. Low thermal resistance from junction to case. The way of controlling power motor via simple push button realizes the use 2N3055 as a switching device and in the same way we can use 2N3055 in other transistor circuits.
So far R1 = 1000K which is minumum ohms according to the book. With transistor going to high resistance state in OFF mode, the collector current also becomes zero bringing motor to stop. I found 2 online 555 calculators if I find R1 & R2 with one calculator the other calculator gives me a different answer and doing math in book gives me a 3rd answer.