Transistor NAND Gate does not work correctly

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atrumblood

Joined May 13, 2012
59
Are you still interested in other RTL & DTL , gates & astable, bistable & monostable multivibrators? Another OP wanted to build basic circuits but never came back- gave him a one-shot. Most of these oldies used Germanium transistors, like 2N404, 2N1305 PNPs & 2N1306 NPN.
Yes I am still interested.
 

Bernard

Joined Aug 7, 2008
5,784
Added extended time OS & Toggle, R-S FF to the collection. The trip points are not defined nearly as well as a 555, but guess time T on OS about 1/2 RC, where R is 1M in parallel with 2M. Should have made more measurements before breaking them down. Astable period about RC where R is 27k, Not too much leeway on the 27k, maybe 15k to 47k, not tested. Also have some converted to T MOS. from old vacuum tube ckts.
Resistor next to Cx on OS is 2.2k, another R missing on input side, probably 56k.
 

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