Version 4.1
SHEET 1 3052 2480
WIRE 2208 1872 2064 1872
WIRE 2064 1888 2064 1872
WIRE 2208 1888 2208 1872
WIRE 1520 1984 1504 1984
WIRE 2064 1984 2064 1968
WIRE 2208 1984 2208 1968
WIRE 2304 1984 2208 1984
WIRE 1024 2048 1024 2000
WIRE 1120 2048 1024 2048
WIRE 1216 2048 1216 2000
WIRE 1216 2048 1184 2048
WIRE 1280 2048 1216 2048
WIRE 1360 2048 1280 2048
WIRE 1504 2048 1504 1984
WIRE 1504 2048 1440 2048
WIRE 1536 2048 1504 2048
WIRE 1600 2048 1536 2048
WIRE 1712 2048 1664 2048
WIRE 1920 2048 1712 2048
WIRE 2032 2048 1920 2048
WIRE 2080 2048 2032 2048
WIRE 2160 2048 2080 2048
WIRE 2032 2064 2032 2048
WIRE 1024 2080 1024 2048
WIRE 1280 2080 1280 2048
WIRE 1920 2080 1920 2048
WIRE 2208 2128 2208 2080
WIRE 2304 2128 2208 2128
WIRE 2032 2144 2032 2128
WIRE 2096 2144 2032 2144
WIRE 2112 2144 2096 2144
WIRE 2208 2144 2208 2128
WIRE 2208 2144 2176 2144
WIRE 1712 2160 1712 2048
WIRE 2032 2160 2032 2144
WIRE 2208 2160 2208 2144
WIRE 1024 2192 1024 2160
WIRE 1280 2192 1280 2160
WIRE 1920 2192 1920 2160
WIRE 1536 2208 1536 2048
WIRE 2032 2256 2032 2224
WIRE 2208 2256 2208 2240
WIRE 1024 2304 1024 2272
WIRE 1280 2304 1280 2272
WIRE 1536 2304 1536 2272
WIRE 1712 2304 1712 2224
FLAG 1920 2192 0
FLAG 2032 2256 0
FLAG 2208 2256 0
FLAG 2064 1984 0
FLAG 1712 2304 0
FLAG 2304 1984 drain
FLAG 2304 2128 source
FLAG 2080 2048 gate
FLAG 2096 2144 fb
FLAG 1536 2304 0
FLAG 1280 2304 0
FLAG 1504 1984 varactor_volts
FLAG 1024 2304 0
FLAG 1024 2000 mic_output
FLAG 1216 2000 mic_out_plus_dc
SYMBOL NJF 2160 1984 R0
SYMATTR InstName Q1
SYMATTR Value 2N5484
SYMBOL RES 2192 1872 R0
SYMATTR InstName R1
SYMATTR Value 500
SYMBOL res 2192 2144 R0
SYMATTR InstName R2
SYMATTR Value 1K
SYMBOL ind 1936 2176 R180
WINDOW 0 3 79 Right 2
WINDOW 3 1 40 Right 2
SYMATTR InstName L1
SYMATTR Value 100µ
SYMBOL cap 2016 2064 R0
SYMATTR InstName C1
SYMATTR Value 500p
SYMBOL cap 2016 2160 R0
SYMATTR InstName C2
SYMATTR Value 500p
SYMBOL cap 2176 2128 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value 200p
SYMBOL VOLTAGE 2064 1872 R0
SYMATTR InstName V1
SYMATTR Value 7.
SYMBOL diode 1696 2224 M180
WINDOW 0 24 72 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL varactor 1552 2272 R180
WINDOW 0 -62 63 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2_varact_diode
SYMATTR Value KV1471
SYMBOL cap 1664 2032 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C4
SYMATTR Value 1.5n
SYMBOL voltage 1280 2176 R0
WINDOW 0 -125 10 Left 2
SYMATTR InstName V2_varact_bias_V
SYMATTR Value 3.3V
SYMBOL res 1456 2032 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3_varact_bias
SYMATTR Value 60k
SYMBOL voltage 1024 2176 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 3 -83 105 Left 2
SYMATTR Value SINE(0 0.300 1k)
SYMATTR InstName V3
SYMBOL cap 1184 2032 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C5
SYMATTR Value 220n
SYMBOL res 1008 2064 R0
SYMATTR InstName R4
SYMATTR Value 600R
SYMBOL res 1264 2064 R0
SYMATTR InstName R5
SYMATTR Value 33k
TEXT 1832 2288 Left 2 !.tran 0 120m 20m 10n startup
TEXT 1832 2320 Left 2 !.options method=trap
TEXT 1472 1832 Left 2 ;Varactor diode is\nKV1471\n35pF at 1V\n6.5pf at 5V
TEXT 864 2216 Left 2 ;mic output \nof 100mV
TEXT 880 2096 Left 2 ;typical mic\noutput Z
TEXT 1088 1384 Left 4 ;instructions
TEXT 928 1448 Left 2 ;click on run\nthen click on "mic_out_plus_dc" to plot it.\nthen click on the plot window then on plot settings / add plot pane\nthen click on "varactor_volts" to plot it\nthen click on the plot window and plot settings/add plot pane\nthen click on "source" to plot it\nthen click on the plot window,\nthen click on View/FFT\nthen click on V(source) in the window that opens,\nthis will plot its FFT, zoom to around 1Mhz in the FFT graph
TEXT 1264 1320 Left 5 ;Colpits FM osc, 1khz audio input.