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Dec 11, 2017 at 3:39 history edited D.A.S. CC BY-SA 3.0
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Dec 11, 2017 at 2:53 comment added D.A.S. You can examine 1970 datasheets for discrete TTL NOR gates to look at datasheets or web images for SR FF , here dual gate SR latch and 2 more gates turns into JK FF electronics-tutorials.ws/sequential/seq13.gif It is better to learn how it was done than guess.
Dec 11, 2017 at 2:51 comment added D.A.S. Vbe4 is about 0.7V when biased on and 0.2V when off from Q1 or Q2 s o the LED Vf of ~2V for R/Y or ~3V for G/B/W would never work.
Dec 10, 2017 at 21:58 comment added alexm Thanks for your answer. I just wanted to make it for learning purposes. I guess I just don't understand how to find Vbe4.
Dec 10, 2017 at 21:48 history answered D.A.S. CC BY-SA 3.0