Audio Frequency Amplifier

For schematic diagram please see the attached file.

The PCB layout, bill of material and spice netlist are attached.

I used CircuitMaker (A version of SPICE which comes with a really nice GUI) for simulation of the Audio frequency Amplifier and TraxMaker for PCB layout.

SPICE simulations inlude DC operating point, transient and AC analysis (AudioFrequencyAmplifier.pdf).

The Bill of Materials for Audio Frequency Amplifier is as follows:

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Item Count Label-Value Attributes Designation
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1 2 4.7uF RAD0.2 C1,C2
2 1 47uF RAD0.2 C3
3 1 220uF RAD0.2 C4
4 2 1N4148 DIODE0.4 D1,D2
5 2 BC548B TO-92B Q1,Q2
6 1 BC558B TO-92B Q3
7 1 25k var SIP3 R1
8 1 180 AXIAL0.4 R2
9 1 1.2e6 AXIAL0.4 R3
10 1 4.7e3 AXIAL0.4 R4
11 1 8 SIP2 SPK1
12 1 9V (none) V1
13 1 -100m/100mV SIP2 V2
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SPICE Netlist
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V2 INPUT 0 DC 0 SIN(0 100m 3k 0 0) AC 1 0
R1A 0 C2_1 20000
R1B C2_1 C1_2 5000
C1 INPUT C1_2 4.7uF
C2 C2_1 R3_1 4.7uF
Q1 D2_K R3_1 0 QBC548B
Q2 V1_1 R4_1 C3_1 QBC548B
Q3 0 D2_K C3_1 QBC558B
D1 R4_1 R2_2 D1N4148
D2 R2_1 D2_K D1N4148
C3 C3_1 SPK1_2 47uF
C4 0 V1_1 220uF
V1 V1_1 0 DC 9V
R2 R2_1 R2_2 180
R3 R3_1 C3_1 1.2e6
R4 R4_1 SPK1_2 4.7e3
RSPK1 V1_1 SPK1_2 8
.SAVE INPUT R3_1 C2_1 V1_1 D2_K R4_1 C3_1 R2_1 R2_2 SPK1_2 C1_2 @v2[p] v2#branch
.SAVE @v2[z] @c1[p] @c1[i] @c2[p] @c2[i] @q1[p] @q1[ic] @q1[ib] @q1[ie] @q2[p]
.SAVE @q2[ic] @q2[ib] @q2[ie] @q3[p] @q3[ic] @q3[ib] @q3[ie] @d1[p] @d1[id]
.SAVE @d2[p] @d2[id] @c3[p] @c3[i] @c4[p] @c4[i] @v1[p] v1#branch @v1[z] @r2[p]
.SAVE @r2[i] @r3[p] @r3[i] @r4[p] @r4[i] @rspk1[p]

* Selected Circuit Analyses :
.OP
.AC DEC 100 1 4Meg
.TRAN 6.667u 1.667m 0 6.667u

* Models/Subcircuits Used:

*BC548B Si 625mW 30V 100mA 300MHz Amp pkg:TO-92B 3,2,1
.MODEL QBC548B NPN (IS=10.2F NF=1 BF=377 VAF=98.6 IKF=60M ISE=3.47P NE=2
+ BR=4 NR=1 VAR=24 IKR=90M RE=0.515 RB=2.06 RC=0.206 XTB=1.5
+ CJE=7.05P VJE=1.1 MJE=0.5 CJC=5.21P VJC=0.3 MJC=0.3 TF=530P TR=368N)

*BC558B Si 625mW 30V 100mA 320MHz Amp pkg:TO-92B 3,2,1
.MODEL QBC558B PNP (IS=10.2F NF=1 BF=377 VAF=98.6 IKF=60M ISE=3.47P NE=2
+ BR=4 NR=1 VAR=20 IKR=90M RE=0.515 RB=2.06 RC=0.206 XTB=1.5
+ CJE=24.9P VJE=1.1 MJE=0.5 CJC=8.67P VJC=0.3 MJC=0.3 TF=497P TR=345N)

*1N4148 75V 10mA Si Computer Diode pkg:DIODE0.4 A,K
.MODEL D1N4148 D (IS=14.2P RS=4.2 N=1.7 BV=75 IBV=5U
+ CJO=1.74P VJ=0.75 M=0.333 TT=4.32N)
.END