TTL Toggle flip flop improved

146

02:06:49

It is a TFF made out of bipolar transistors. First hit the power switch for "solution"(one way switch), then hit the two way switch as a button("on" and "off") for a "clock", the LED(output) Turns "on", then the next time it turns "off". Watch out! It takes a while to show the results of the LED. Please use patients. Warning-you have anxiety problems don't use this circuit. 

published 11 years ago

hurz

11 years ago

Good to see you made it by your own. Very nice, because the layout shows very nice what logic is behind if you know the nand gate version. Have you tried to make it lowpower? I would focus first on function and than maybe go on power reduction. 100kOhm as base resistor and 20k as standard collector working resistor is much to high for my feeling. 10k and 1k is mostly a good start. Anyway I like it because its not just stupid gates connecting its understanding of electronic and not just algebra, keep on inventing!

hurz

11 years ago

Have you seen my version "JK Master Slave Flip Flop - as 1bit counter"? I used about half the number of transis, cuz my rs latch just need 2 like blinkie and as well needs just 2 for clock gating as common base configuration. The clock inverter is the same as yours. So I got 8+1 and you 2 per nand makes 16+1

Voltransistor

11 years ago

Thankyou, you are right! After having lots of resistors in parallel to funtion just the circuit, you do need high resistant resistors, to make it more efficient. If you make a 4-bit binary counter, the 22k ohm resistors will reduce lower that 1k ohm, which draw to much energy just for a circuit.

hurz

11 years ago

But high resistance means slow circuit. So its always a tradeoff. But the start should be a medium rating and not extrem values. Not to low and not to high.

Voltransistor

11 years ago

True, you get the pros and cons, for the lower and higher resistance. At least it's not a "CMOS" circuit, they are really slow.

hurz

11 years ago

Mos is not slow by default, the main advantage of mos is the simplicity, e.g. a perferct inverter just need two mosfets as complemetary pair. In bipolar impossible, it need 4or5 and still looses some voltage for high level 2times Ube. Mos if limited by gate capacity to Rdson resistor ratio, limited in speed. But todays processes are quite good, relative low capacity and relative low Rdson, for some GHz!

Voltransistor

11 years ago

That's cool. Interesting. CMOS does damage with static discharge, but it is very efficient.

Struja

10 years ago

Nice work,bro!!!

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