Merge pull request #125 from 3hhh/main

add LTSpice simulations of the basic edrumulus circuits

hardware/prototype_3hhh/edrumulus.asc

@@ -0,0 +1,84 @@
+Version 4
+SHEET 1 1420 712
+WIRE 288 -336 176 -336
+WIRE 176 -272 176 -336
+WIRE 288 -272 288 -336
+WIRE 176 -128 176 -192
+WIRE 320 -128 176 -128
+WIRE 176 0 176 -128
+WIRE 320 0 320 -128
+WIRE -64 112 -192 112
+WIRE 176 112 176 64
+WIRE 176 112 16 112
+WIRE 320 112 320 80
+WIRE 320 112 176 112
+WIRE 544 112 320 112
+WIRE 688 112 544 112
+WIRE -192 128 -192 112
+WIRE 176 144 176 112
+WIRE 320 144 320 112
+WIRE 544 144 544 112
+WIRE -192 240 -192 192
+WIRE 176 272 176 208
+WIRE 240 272 176 272
+WIRE 320 272 320 224
+WIRE 320 272 240 272
+WIRE 544 304 544 208
+WIRE 240 320 240 272
+WIRE -192 384 -192 320
+FLAG -192 384 0
+FLAG 288 -272 0
+FLAG 240 320 0
+FLAG 544 304 0
+SYMBOL voltage -192 224 R0
+WINDOW 123 0 0 Left 0
+WINDOW 39 24 124 Left 2
+WINDOW 3 24 44 Left 2
+SYMATTR Value SINE(0 {Vp} 2k)
+SYMATTR InstName V1
+SYMBOL cap -208 128 R0
+SYMATTR InstName C1
+SYMATTR Value 15n
+SYMBOL schottky 192 64 R180
+WINDOW 0 24 64 Left 2
+WINDOW 3 24 0 Left 2
+SYMATTR InstName D1
+SYMATTR Value BAT54
+SYMATTR Description Diode
+SYMATTR Type diode
+SYMBOL schottky 192 208 R180
+WINDOW 0 24 64 Left 2
+WINDOW 3 24 0 Left 2
+SYMATTR InstName D2
+SYMATTR Value BAT54
+SYMATTR Description Diode
+SYMATTR Type diode
+SYMBOL res 304 -16 R0
+SYMATTR InstName R1
+SYMATTR Value {Rp}
+SYMBOL res 304 128 R0
+SYMATTR InstName R2
+SYMATTR Value {Rp}
+SYMBOL voltage 176 -176 R180
+WINDOW 123 0 0 Left 0
+WINDOW 39 0 0 Left 0
+SYMATTR InstName V2
+SYMATTR Value 3.3
+SYMBOL res 32 96 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R3
+SYMATTR Value {Rs}
+SYMBOL cap 528 144 R0
+SYMATTR InstName C2
+SYMATTR Value {Cp}
+TEXT -320 240 Left 2 ;Piezo
+TEXT 704 104 Left 2 ;gpio
+TEXT 624 200 Left 1 ;gain adjustment
+TEXT -320 472 Left 2 !.tran 0 5m 2m
+TEXT -320 552 Left 2 !.param Rp 10k
+TEXT -312 608 Left 2 !.param Cp 1p
+TEXT -320 512 Left 2 !.param Vp 1
+TEXT -312 584 Left 2 !.step param Rs list 1k 2k 5k 10k
+TEXT 128 456 Left 2 ;Rs needs min 10k for low current (1mA at 10V piezo input)\nto make the forward voltage of the Shottky\ndiodes small (~0,3V) as the Teensy\nGPIO input only supports -0,3V to 3,6V
+TEXT 128 584 Left 2 ;If a pad draw current from the voltage divider, Rp+Rs cannot\nbe too large (~30k) as the 1.65V of the voltage divider will\notherwise drop. :(\nTest your pads by reading from the analog pin when connected\nvs disconnected (both should be around 1.65V)!

hardware/prototype_3hhh/edrumulus_hihat.asc

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+Version 4
+SHEET 1 880 680
+WIRE 288 -336 176 -336
+WIRE 176 -272 176 -336
+WIRE 288 -272 288 -336
+WIRE 176 -128 176 -192
+WIRE 320 -128 176 -128
+WIRE 176 0 176 -128
+WIRE 320 0 320 -128
+WIRE 176 112 176 64
+WIRE 176 112 -48 112
+WIRE 320 112 320 80
+WIRE 320 112 176 112
+WIRE 464 112 320 112
+WIRE 688 112 544 112
+WIRE -192 128 -192 112
+WIRE 176 144 176 112
+WIRE -192 224 -192 208
+WIRE -48 224 -48 112
+WIRE -48 224 -192 224
+WIRE -192 240 -192 224
+WIRE 176 272 176 208
+WIRE 240 272 176 272
+WIRE 240 320 240 272
+WIRE -192 384 -192 320
+FLAG -192 384 0
+FLAG 288 -272 0
+FLAG 240 320 0
+SYMBOL diode 192 64 R180
+WINDOW 0 24 64 Left 2
+WINDOW 3 24 0 Left 2
+SYMATTR InstName D1
+SYMATTR Value 1N4148
+SYMBOL diode 192 208 R180
+WINDOW 0 24 64 Left 2
+WINDOW 3 24 0 Left 2
+SYMATTR InstName D2
+SYMATTR Value 1N4148
+SYMBOL res 304 -16 R0
+SYMATTR InstName R1
+SYMATTR Value {Rp}
+SYMBOL voltage 176 -176 R180
+WINDOW 123 0 0 Left 0
+WINDOW 39 0 0 Left 0
+SYMATTR InstName V2
+SYMATTR Value 3.3
+SYMBOL res 560 96 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R3
+SYMATTR Value {Rs}
+SYMBOL res -208 112 R0
+SYMATTR InstName Rh1
+SYMATTR Value {Rh1}
+SYMBOL res -208 224 R0
+SYMATTR InstName Rh2
+SYMATTR Value {Rh2}
+TEXT 704 104 Left 2 ;gpio
+TEXT -320 472 Left 2 !.tran 0 4m
+TEXT -320 512 Left 2 !.param Rp 10k
+TEXT -320 552 Left 2 !.param Rs 10k
+TEXT -608 224 Left 2 ;Hihat Controller Potentiometer
+TEXT -568 264 Left 2 !.param Rh1 = Rh*P/100
+TEXT -568 312 Left 2 !.param Rh2 = Rh*(1-P/100)
+TEXT -568 352 Left 2 !.param Rh 35k
+TEXT -568 392 Left 2 !.step param P 1 99 10
+TEXT -104 512 Left 2 ;choosing Rp ~ 1/2 Rh seems to be a good idea\ntoo high Rp impacts maximum signal range\ntoo low Rp impacts minimum signal range