So going further with replicating circuits from old Russian magazine (1983):
Now using 2 NANDs (version with LEDs) I built trigger (as on Fig.7 above):
Then added couple resistors and couple capacitors to get universal trigger (as on Fig.8)
That can toggle state if inputs 5 and 6 connected together - 100 Hz:
It looks like this is a limit (and trick with "speed-up" capacitor doesn't help) - probably I should play with values of resistors and capacitors...
UPDATE: Everything above was for C1=C2=10000 pF, now I'm trying 470 pF
On 50 kHz it doesn't look good...
UPDATE (04/10/2016): Today 50 kHz looks much healthier - I don't know why :)
But if go higher output shape is quickly shifted up (to the ground) - probably because of natural limit that caused by latency about 5 us...
P.S. Almost forgot - 32 kHz sine signal :)
P.P.S. Redrawn schematics:
Note: Wires that goes above diodes are NOT connected to diodes' cathodes as may mistakenly appear in your mind (check closely - there are no dots there)