Version 4.1 SHEET 1 2788 820 WIRE 720 -512 688 -512 WIRE -32 -464 -80 -464 WIRE 160 -464 -32 -464 WIRE 256 -464 160 -464 WIRE 368 -464 256 -464 WIRE 720 -464 720 -512 WIRE 880 -464 720 -464 WIRE 1008 -464 944 -464 WIRE 1120 -464 1008 -464 WIRE 1152 -464 1120 -464 WIRE 1168 -464 1152 -464 WIRE 720 -448 720 -464 WIRE 720 -448 640 -448 WIRE 368 -416 368 -464 WIRE 448 -416 368 -416 WIRE 640 -416 640 -448 WIRE 640 -416 544 -416 WIRE 1008 -416 1008 -464 WIRE 1120 -416 1120 -464 WIRE -80 -400 -80 -464 WIRE 256 -400 256 -464 WIRE 448 -336 368 -336 WIRE 640 -336 544 -336 WIRE -80 -288 -80 -320 WIRE 256 -288 256 -336 WIRE 368 -288 368 -336 WIRE 640 -272 640 -336 WIRE 896 -272 640 -272 WIRE 1008 -272 1008 -352 WIRE 1008 -272 896 -272 WIRE 1120 -272 1120 -336 WIRE 1120 -272 1008 -272 WIRE 160 -256 160 -464 WIRE 896 -240 896 -272 WIRE 256 -192 256 -208 WIRE 368 -192 368 -208 WIRE 368 -192 256 -192 WIRE 368 -144 368 -192 WIRE 432 -144 368 -144 WIRE 512 -144 432 -144 WIRE 368 -128 368 -144 WIRE -80 -80 -96 -80 WIRE -32 -80 -80 -80 WIRE 32 -80 -32 -80 WIRE 160 -80 160 -176 WIRE 160 -80 96 -80 WIRE 208 -80 160 -80 WIRE 304 -80 208 -80 WIRE -464 -64 -496 -64 WIRE -336 -64 -384 -64 WIRE 368 -16 368 -32 WIRE 560 -16 368 -16 WIRE -336 0 -336 -64 WIRE -272 0 -336 0 WIRE 368 0 368 -16 WIRE 416 0 368 0 WIRE -80 16 -80 -80 WIRE -80 16 -176 16 WIRE 160 16 160 -80 WIRE -272 32 -272 0 WIRE -176 48 -176 16 WIRE -32 48 -32 -80 WIRE 368 64 368 0 WIRE 560 80 560 64 WIRE -496 128 -496 -64 WIRE -272 144 -272 112 WIRE -272 144 -336 144 WIRE -176 144 -176 128 WIRE -80 144 -176 144 WIRE -336 192 -336 144 WIRE -80 192 -80 144 WIRE -32 192 -32 112 WIRE -32 192 -80 192 WIRE 160 192 160 96 WIRE 160 192 -32 192 WIRE 288 192 160 192 WIRE 368 192 368 144 WIRE 368 192 288 192 WIRE 560 192 560 144 WIRE 560 192 368 192 WIRE 288 240 288 192 WIRE -496 384 -496 128 WIRE 304 384 -496 384 WIRE -432 464 -464 464 WIRE -128 496 -144 496 WIRE -464 528 -464 464 WIRE 304 528 304 384 WIRE 304 528 112 528 WIRE -144 560 -144 496 WIRE 112 576 112 528 WIRE -464 672 -464 608 WIRE -144 688 -144 640 WIRE 112 688 112 656 FLAG -496 128 incoming_signals FLAG -432 464 Local_osc FLAG -464 672 0 FLAG -144 688 0 FLAG -128 496 1khz_audio FLAG 112 688 0 FLAG -32 -464 Vsupply FLAG 288 240 0 FLAG 208 -80 base FLAG 432 -144 collector FLAG 416 0 emmitter FLAG -96 -80 one FLAG 896 -240 0 FLAG 688 -512 two FLAG 1152 -464 out FLAG -80 -288 0 FLAG -336 192 0 SYMBOL cap -48 48 R0 SYMATTR InstName C1 SYMATTR Value 250p SYMBOL ind -288 16 R0 SYMATTR InstName L1 SYMATTR Value 40µ SYMATTR Type ind SYMBOL bv 112 560 R0 WINDOW 3 -84 103 Left 2 SYMATTR Value V=0.1*V(Local_osc)*(1+0.5*V(1khz_audio)) SYMATTR InstName B1 SYMBOL voltage -464 512 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 WINDOW 3 -46 106 Left 2 SYMATTR Value SINE(0 100m 1.6Meg) SYMATTR InstName V2 SYMBOL voltage -144 544 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 WINDOW 3 -38 101 Left 2 SYMATTR Value SINE(0 1 1k) SYMATTR InstName V3 SYMBOL res -368 -80 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 50R SYMBOL ind -192 32 R0 SYMATTR InstName L2 SYMATTR Value 40µ SYMATTR Type ind SYMBOL res 144 -272 R0 SYMATTR InstName R3 SYMATTR Value 1.84k SYMBOL npn 304 -128 R0 SYMATTR InstName Q1 SYMATTR Value 2N2222 SYMBOL res 144 0 R0 SYMATTR InstName R4 SYMATTR Value 300R SYMBOL cap 96 -96 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C3 SYMATTR Value 100n SYMBOL res 352 48 R0 SYMATTR InstName R_emmitter1 SYMATTR Value 300R SYMBOL voltage -80 -416 R0 SYMATTR InstName V1 SYMATTR Value 15V SYMBOL cap 544 80 R0 SYMATTR InstName C5 SYMATTR Value 100n SYMBOL res 544 -32 R0 SYMATTR InstName R_emmitter_1 SYMATTR Value 30R SYMBOL cap 240 -400 R0 SYMATTR InstName C6 SYMATTR Value 250p SYMBOL ind 432 -432 R0 SYMATTR InstName L3 SYMATTR Value 40µ SYMATTR Type ind SYMBOL cap 992 -416 R0 SYMATTR InstName C7 SYMATTR Value 10n SYMBOL res 1104 -432 R0 SYMATTR InstName R6 SYMATTR Value 1k SYMBOL ind 528 -432 R0 SYMATTR InstName L4 SYMATTR Value 40µ SYMATTR Type ind SYMBOL res 240 -304 R0 SYMATTR InstName R1 SYMATTR Value 10R SYMBOL res 352 -304 R0 SYMATTR InstName R5 SYMATTR Value 10R SYMBOL schottky 880 -480 M90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D2 SYMATTR Value BAT54 TEXT -592 -832 Left 4 ;This is more or less a crystal set with added amplification, as its just a detector it can only recieve AM.\nif you add in a beat freq oscillator (BFO) and or a mixer to recieve other modulations\nthen its not realy a TRF reciever anymore!\nnote that the "incoming_signal" strength is below what the crystal set could recieve. TEXT -480 720 Left 2 !.tran 0 0.1 0 100n TEXT -288 432 Left 2 ;AM modulated 1.3 Mhz Source TEXT 912 -144 Left 4 ;Instructions TEXT 784 -88 Left 3 ;click on run\nthen click on "incoming_signal" to plot it.\nthen click on the plot window then on plot settings / add plot pane\nthen click on "collector" to plot it\nthen click on the plot window and plot settings/add plot pane\nthen click on "out" to plot it\nthen click on the plot window then on view / FFT,\nthen click on the desired signals to see their FFTs TEXT -280 0 Left 2 !k1 L1 L2 1 TEXT 800 -520 Left 2 ;diode is a schottky TEXT 440 -440 Left 2 !k2 L3 L4 1 TEXT 888 -568 Left 2 ;detector TEXT -280 -40 Left 2 ;transformer TEXT 424 -488 Left 2 ;transformer TEXT 816 360 Left 2 ;the transformers coupling coefficient is left as 1 TEXT 824 320 Left 4 ;Calculations TEXT 824 456 Left 2 ;choosing a freq somewhere in the MW band.\nfor ease of design letting 2pie f = 10 Meg.\nnote that 2 pie f is called angular velocity\nI am representing this as w (small greek letter Omega)\nso f = 1E7/ 6,28 = 1.6 Mhz\nwith C at about 250 pF, \n1/ (wc) = 1 / ( 10 Meg x 0.25 nF) = 1000/ ( 10 x 0.25 ) \n= 1000/ 2.5 = 400\nas wL will also be 400 at w= 1E7 \nL = 400/ 10 Meg = 40 uH TEXT 808 416 Left 4 ;LC bandpass filter calculations TEXT -584 -912 Left 5 ;TRF or tuned radio freq reciever TEXT 752 744 Left 1 ;You may republish or reuse this circuit implementation and text providing this line and the following lines are included.\nThis circuit implementation designed by Keith Wallbanks. Originally released on analogsimulation.co.uk\nThis circuit is provided as is without warranty of any kind. This text is intended to implement the MIT licence. RECTANGLE Normal 240 736 -496 416 2 RECTANGLE Normal 1200 -224 784 -560 2 RECTANGLE Normal -96 160 -304 -16 2 RECTANGLE Normal 624 -320 400 -464 2