I have a neat little book called "Industrial Transistor Circuits" by Allan Lytel, date of publication April, 1965. Lots of motor control circuits with SCRs, warning flashers, lamp dimmers, power oscillators, timers, counters...all discrete, not an IC in sight. Tucked away near the end is a pulse stretcher circuit that uses a single 3N81 silicon-controlled switch and a couple passives; this is the circuit in LTSpice using transistors:
Unfortunately, it doesn't seem to work using discrete transistors instead of the switch specified. Does anyone make SCSes anymore?
Version 4 SHEET 1 948 680 WIRE 80 -288 80 -336 WIRE 272 -208 272 -336 WIRE -64 -176 -112 -176 WIRE 80 -176 80 -224 WIRE 80 -176 0 -176 WIRE -112 -96 -112 -176 WIRE -64 -96 -112 -96 WIRE 80 -96 80 -176 WIRE 80 -96 16 -96 WIRE 80 -48 80 -96 WIRE 272 0 272 -128 WIRE 272 0 144 0 WIRE -112 64 -112 -96 WIRE 272 144 272 0 WIRE -240 192 -320 192 WIRE 80 192 80 48 WIRE 80 192 -176 192 WIRE 208 192 80 192 WIRE 80 336 80 192 WIRE 128 336 80 336 WIRE 272 336 272 240 WIRE 272 336 208 336 WIRE -320 352 -320 192 WIRE -832 368 -832 240 WIRE -112 416 -112 128 WIRE 32 416 -112 416 WIRE 272 416 272 336 WIRE 272 416 96 416 WIRE -112 448 -112 416 WIRE 272 448 272 416 WIRE -112 576 -112 528 WIRE 272 576 272 528 WIRE -320 592 -320 432 WIRE -832 608 -832 448 FLAG 272 -336 Vcc FLAG 80 -336 Vcc FLAG -832 608 0 FLAG -832 240 Vcc FLAG -320 592 0 FLAG 272 576 0 FLAG -112 576 0 SYMBOL npn 208 144 R0 SYMATTR InstName Q1 SYMATTR Value 2N4124 SYMBOL pnp 144 48 R180 SYMATTR InstName Q2 SYMATTR Value 2N4126 SYMBOL voltage -832 352 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 12 SYMBOL voltage -320 336 R0 WINDOW 3 -368 54 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value PULSE(0 5 100u 5n 5n 500n) SYMBOL diode -240 208 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D1 SYMATTR Value 1N4148 SYMBOL res 256 -224 R0 SYMATTR InstName R3 SYMATTR Value 270 SYMBOL res 256 432 R0 SYMATTR InstName R1 SYMATTR Value 10k SYMBOL res 224 320 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 10k SYMBOL diode 64 -288 R0 SYMATTR InstName D2 SYMATTR Value 1N4148 SYMBOL diode 96 400 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D3 SYMATTR Value 1N4148 SYMBOL res -128 432 R0 SYMATTR InstName R2 SYMATTR Value 100k SYMBOL cap -128 64 R0 SYMATTR InstName C1 SYMATTR Value 5µ SYMBOL res 32 -112 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 37 54 VTop 2 SYMATTR InstName R5 SYMATTR Value 4.7k SYMBOL cap 0 -192 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 10n TEXT -604 336 Left 2 !.tran 200u