How can I build a 555 timer equivalent circuit out of transistors? Answered
I want to go old school and do things the hard way by building an equivalent circuit of the classic 555 timer. There are equivalent circuits on just about any 555 timer data sheet. Such as here... http://www.national.com/ds/LM/LM555.pdf That schematic is for a LM555.
First, what would be a good, easy to find, NPN and PNP transistors to use uniformly in the circuit? Preferably something I could get a pack of at Radio Shack just to make this project easier.
Also I can't figure out what Q5, and Q6, and Q22 are? Please help. They look like transistors, but each of those ones have an extra lead coming out of it? Is that extra lead just a doubled up (collector) ? Also Q22 has no base, or is the base that horizontal line, but in the opposite direction?
I am thoroughly confused already, any help would be great! Thanks in advance.