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+.PS
+# `PPA.m4 Push-pull amplifier'
+cct_init
+
+Vs: source(up_ elen_,"$V_S$")
+ line right elen_/2
+T1: transformer(down_ elen_,,,W,10) with .P1 at Here
+ { dot(at T1.TP+(-dimen_/8,dimen_/3)) }
+ { dot(at T1.TS+(dimen_/8,dimen_*2/3))}
+ { dot(at T1.TS+(dimen_/8,-dimen_/8)) }
+ line from T1.P2 to Vs.start
+
+ line up_ dimen_*3/4 from T1.S1 then right_ dimen_*3/4
+ up_
+Q1: bi_tr(,L,,E) with .B at Here
+ line down_ dimen_*3/4 from T1.S2 then right_ dimen_*3/4
+ down_
+Q2: bi_tr(,R,,E) with .B at Here
+ line from Q1.E to Q2.E
+R2: resistor(left_ dimen_ from last line); llabel(,R_2)
+ dot; {dot(at R2.start) }
+ line to T1.TS
+ line down_ dimen_/2 right_ dimen_/2 from R2.start
+ ground
+
+ line right_ dimen_/6 from R2.start
+Vcc: battery(right_ elen_,2); rlabel(,V_{cc})
+ dot
+ line up dimen_*2/3 then to (R2.start.x,Here.y+dimen_*2/3)
+ resistor(to (R2.end,Here)); rlabel(,R_1); line to R2.end
+ line right_ dimen_/2 from Vcc.end
+T2: transformer(up_ elen_,,,W,10) with .TS at Here
+ line from T2.S2 to (T2.S2,Q1.C) then to Q1.C
+ line from T2.S1 to (T2.S1,Q2.C) then to Q2.C
+
+ line right elen_/2 from T2.P2
+ resistor(down_ to (Here,T2.P1)); llabel(,R_L)
+ line to T2.P1
+
+.PE