initial commit of spice circuit file

* amplifier stage with NE5532 in single supply mode
* ac analysis with printing of amplitude & phase over frequency

spice/raspihead.cir

@@ -0,0 +1,86 @@
+raspiHEAD headphone amplifier
+*
+* simulation of the analog amplifier stage after the pcm2704 dac
+* Torsten Meissner, 2012
+*
+
+* NE5532 subcircuit definition
+***** NE5532 Source: Texas Instruments NE5534
+* C2 added to simulate compensated frequency response (Uwe Beis)
+ 
+* NE5532 OPERATIONAL AMPLIFIER "MACROMODEL" SUBCIRCUIT
+* CREATED USING NE5534 model from Texas InstrumentsAT 12:41
+* (REV N/A)      SUPPLY VOLTAGE: +/-15V
+* CONNECTIONS:   NON-INVERTING INPUT
+*                | INVERTING INPUT
+*                | | POSITIVE POWER SUPPLY
+*                | | | NEGATIVE POWER SUPPLY
+*                | | | | OUTPUT
+*                | | | | |
+.SUBCKT NE5532   1 2 3 4 5
+*
+  C1   11 12 7.703E-12
+  C2    6  7 23.500E-12
+  DC    5 53 DX
+  DE   54  5 DX
+  DLP  90 91 DX
+  DLN  92 90 DX
+  DP    4  3 DX
+  EGND 99  0 POLY(2) (3,0) (4,0) 0 .5 .5
+  FB    7 99 POLY(5) VB VC VE VLP VLN 0 2.893E6 -3E6 3E6 3E6 -3E6
+  GA    6  0 11 12 1.382E-3
+  GCM   0  6 10 99 13.82E-9
+  IEE  10  4 DC 133.0E-6
+  HLIM 90  0 VLIM 1K
+  Q1   11  2 13 QX
+  Q2   12  1 14 QX
+  R2    6  9 100.0E3
+  RC1   3 11 723.3
+  RC2   3 12 723.3
+  RE1  13 10 329
+  RE2  14 10 329
+  REE  10 99 1.504E6
+  RO1   8  5 50
+  RO2   7 99 25
+  RP    3  4 7.757E3
+  VB    9  0 DC 0
+  VC    3 53 DC 2.700
+  VE   54  4 DC 2.700
+  VLIM  7  8 DC 0
+  VLP  91  0 DC 38
+  VLN   0 92 DC 38
+.MODEL DX D(IS=800.0E-18)
+.MODEL QX NPN(IS=800.0E-18 BF=132)
+.ENDS
+
+
+vin 1 0 pulse (0.0V 1.0V 2ms) ac 1.0 dc 0.0
+vcc 3 0 DC 18
+
+c1 1 2 100.0u
+c2 6 8 1.0m
+c3 4 0 100.0u
+c4 7 0 100.0u
+c5 3 0 100.0n
+
+r1 2 4 100.0K
+r2 5 6 10.0K
+r3 3 4 10.0K
+r4 5 7 10.0K
+r5 4 0 10.0K
+r6 8 0 16.0
+
+XOPA 2 5 3 0 6 NE5532
+
+
+.control
+  * dispose of any 'save' statements from previous runs
+  delete all
+  * perform an ac analysis
+  ac dec 10 0.1Hz 50kHz
+  * plot the magnitude of the voltage at node 2 vs frequency
+  plot db(v(8)) xlog
+  plot ph(v(8)) xlog
+.endc
+
+.end