* Z:\home\khalils\Downloads\files\data\raw_asc\512498a2a006_futaba-encoder-pulse-avalanche.asc
* Generated by LTspice 26.0.1 for Windows.
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R4 N001 N014 50k
R5 N014 N037 82k
R6 N014 N038 82k
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.model D D
.lib C:\users\khalils\AppData\Local\LTspice\lib\cmp\standard.dio
.model NPN NPN
.model PNP PNP
.lib C:\users\khalils\AppData\Local\LTspice\lib\cmp\standard.bjt
.tran 0.2
* Futaba 6ch
* C
* R
* C & R determine the length of the pulse.\nWhen the oscilator drops voltage across C\nthe resistor R is responsible to charge C.
* When the oscilator drops the voltage across C,\nthe capacitor drops the voltabe in the base of\ntransistor cutting it off. This raises the voltage\nin the collector of transistor charging capacitors\nconnected to it. After C charges enoughtly the\ntransistor enables again dropping the voltage on\nits collector, generating a negative voltage on\nthe other side of capacitors.
.backanno
.end

* LTspice schematic (.asc):
Version 4
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WINDOW 3 32 56 VTop 2
SYMATTR InstName R49
SYMATTR Value 1.5k
SYMBOL Cap 2016 -464 R180
WINDOW 0 24 56 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C27
SYMATTR Value 470p
SYMBOL Cap 1840 -464 R180
WINDOW 0 24 56 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C28
SYMATTR Value 0.001u
SYMBOL Res 1664 -544 R0
SYMATTR InstName R50
SYMATTR Value 10k
SYMBOL Res 1664 -576 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R51
SYMATTR Value 10k
SYMBOL Cap -16 -336 R0
SYMATTR InstName C29
SYMATTR Value 0.001u
SYMBOL Cap -176 -160 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C30
SYMATTR Value 0.015u
SYMBOL Cap 512 -160 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C31
SYMATTR Value 0.005u
SYMBOL npn 3984 352 R0
SYMATTR InstName Q12
SYMBOL Diode 4224 480 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D12
SYMBOL Res 4304 512 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R47
SYMATTR Value 47k
SYMBOL Res 3952 336 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R52
SYMATTR Value 82k
SYMBOL Res 3952 192 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R53
SYMATTR Value 100k
SYMBOL Cap 4224 304 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C32
SYMATTR Value 0.0015u
SYMBOL Res 4032 208 R0
SYMATTR InstName R54
SYMATTR Value 4.7k
SYMBOL Cap 3920 432 R0
SYMATTR InstName C33
SYMATTR Value 0.001u
SYMBOL Cap 3808 192 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C34
SYMATTR Value 0.04u
SYMBOL Res 3488 96 R0
SYMATTR InstName R55
SYMATTR Value 2.7k
TEXT -456 688 Left 2 !.tran 0.2
TEXT -488 776 Left 2 ;Futaba 6ch
TEXT 456 88 Left 2 ;C
TEXT 568 128 Left 2 ;R
TEXT 336 -48 Left 2 ;C & R determine the length of the pulse.\nWhen the oscilator drops voltage across C\nthe resistor R is responsible to charge C.
TEXT 600 600 Left 2 ;When the oscilator drops the voltage across C,\nthe capacitor drops the voltabe in the base of\ntransistor cutting it off. This raises the voltage\nin the collector of transistor charging capacitors\nconnected to it. After C charges enoughtly the\ntransistor enables again dropping the voltage on\nits collector, generating a negative voltage on\nthe other side of capacitors.