Version 4.1 SHEET 1 3068 2660 WIRE 1280 1728 1232 1728 WIRE 1440 1728 1360 1728 WIRE 1648 1728 1440 1728 WIRE 1648 1744 1648 1728 WIRE 1696 1744 1648 1744 WIRE 1936 1744 1776 1744 WIRE 2016 1744 1936 1744 WIRE 2208 1744 2096 1744 WIRE 1232 1760 1232 1728 WIRE 1696 1760 1696 1744 WIRE 1776 1760 1776 1744 WIRE 2208 1760 2208 1744 WIRE 1696 1840 1648 1840 WIRE 2208 1856 2208 1840 WIRE 1232 1888 1232 1840 WIRE 1344 1888 1232 1888 WIRE 1648 1888 1648 1840 WIRE 1648 1888 1344 1888 WIRE 1776 1888 1776 1840 WIRE 1808 1888 1776 1888 WIRE 1344 1904 1344 1888 WIRE 1776 1920 1776 1888 WIRE 1872 1920 1776 1920 WIRE 2064 1920 1872 1920 WIRE 2176 1920 2064 1920 WIRE 1872 1952 1872 1920 WIRE 2064 1952 2064 1920 WIRE 2176 1968 2176 1920 WIRE 1872 2064 1872 2032 WIRE 2064 2064 2064 2032 WIRE 2064 2064 1872 2064 WIRE 2176 2064 2176 2032 WIRE 2176 2064 2064 2064 WIRE 1872 2144 1872 2064 WIRE 1936 2144 1872 2144 WIRE 2016 2144 1936 2144 WIRE 2304 2144 2080 2144 WIRE 2320 2144 2304 2144 WIRE 1872 2160 1872 2144 WIRE 2304 2192 2304 2144 WIRE 1456 2208 1408 2208 WIRE 1552 2208 1456 2208 WIRE 1712 2208 1632 2208 WIRE 1808 2208 1712 2208 WIRE 1408 2256 1408 2208 WIRE 1872 2288 1872 2256 WIRE 1920 2288 1872 2288 WIRE 2064 2288 1920 2288 WIRE 1872 2304 1872 2288 WIRE 1408 2416 1408 2336 WIRE 1792 2416 1408 2416 WIRE 1872 2416 1872 2384 WIRE 1872 2416 1792 2416 WIRE 2304 2416 2304 2272 WIRE 2304 2416 1872 2416 WIRE 2384 2416 2304 2416 WIRE 1792 2432 1792 2416 FLAG 1344 1904 0 FLAG 1440 1728 audio FLAG 1808 1888 VCC_plus_audio FLAG 2320 2144 out FLAG 1456 2208 RF_osc_input FLAG 1792 2432 0 FLAG 1712 2208 base FLAG 1936 2144 collector FLAG 1920 2288 emmitter FLAG 2208 1856 0 FLAG 1936 1744 Vcc SYMBOL ind 1680 1744 R0 SYMATTR InstName L2 SYMATTR Value 1H SYMATTR Type ind SYMBOL ind 1760 1744 R0 SYMATTR InstName L3 SYMATTR Value 1H SYMATTR Type ind SYMBOL voltage 1232 1744 R0 WINDOW 3 -41 121 Left 2 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR Value SINE(0 2 1k) SYMATTR InstName V2 SYMBOL res 1376 1712 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 10R SYMBOL res 2112 1728 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 1R SYMBOL npn 1808 2160 R0 SYMATTR InstName Q2 SYMATTR Value 2N2222 SYMBOL cap 2080 2128 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C4 SYMATTR Value 1µ SYMBOL res 1856 1936 R0 SYMATTR InstName R_collector SYMATTR Value 20k SYMBOL res 1856 2288 R0 SYMATTR InstName R_emmitter_1 SYMATTR Value 10R SYMBOL voltage 1408 2240 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V3 SYMATTR Value SINE(0 1 100k) SYMBOL res 2288 2176 R0 SYMATTR InstName R5 SYMATTR Value 1Meg SYMBOL ind 2048 1936 R0 SYMATTR InstName L4 SYMATTR Value 100µ SYMATTR SpiceLine Rser=1m SYMBOL cap 2160 1968 R0 SYMATTR InstName C5 SYMATTR Value 25.4n SYMBOL res 1536 2192 M90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 100R SYMBOL voltage 2208 1744 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V4 SYMATTR Value 15V TEXT 320 2184 Left 2 !.tran 0 21m 1m 10n startup TEXT 328 1768 Left 4 ;Instructions TEXT 1680 1712 Left 2 !k1 L2 L3 1 TEXT 800 1280 Left 5 ;AM by applying audio to Vcc TEXT 744 1512 Left 2 ;this circuit has an audio frequency power transformer which will be quite large.\nchanging this power transformer for an SMPS (as in the next circuit) reduces the size of this. TEXT 1528 1760 Left 2 ;audio freq \npower\ntransformer TEXT 736 1368 Left 4 ;Vcc is often used to mean the power supply rail.\nThe circuit applying the audio to Vcc is linear for this circuit.\nthe circuit functions but the base and emmitter voltage waveforms show distortion. TEXT 2232 2304 Left 2 ;R3 is to give the node "out"\na Dc path to ground.\nSpice requires this. TEXT 320 1824 Left 2 ;click on run\nthen click on "VCC_plus_audio" to plot it.\nthen click on the plot window then on plot settings / add plot pane\nthen click on "RF_osc_input" to plot it\nthen click on the plot window and 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 "output" to plot it\nthen click on the plot window and View/FFT\nin the window that opens, click on Vout then okay,\nin the graph that opens zoom around 100khz \nto see the carrier and AM sidebands. TEXT 1344 1616 Left 6 ;AM by applying audio to Vcc TEXT 312 2248 Left 2 ;You may republish this circuit and text providing this line \nand the following lines are included.\nCircuit design by Keith Wallbanks.,\nOriginally released on analogsimulation.co.uk\nThis circuit is provided as is without warranty of any kind.\nThe intention of this text is to implement the MIT licence. TEXT 320 2424 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 1856 1856 1664 1696 2