french_amp.ngjs

#!/usr/bin/env ngspicejs
// Weird french 2 BJT amplifier
// linter: ngspicejs-lint
"use strict";

battery('U1', 10, 0, 9);

resistor('R1', 2, 4, '220k');
resistor('R2', 4, 10, '1k');
resistor('R3', 5, 6, '470k');
resistor('R4', 7, 6, '22k');
resistor('R5', 7, 0, '100');
resistor('R6', 6, 0, '2k2');
var r7 = resistor('R7', 11, 0, '50k');

capacitor('C1', 1, 2, '4u7');
capacitor('C2', 4, 5, '1u');
capacitor('C3', 6, 11, '4u7');

npn('T1', 4, 2, 7, 'BC547');
pnp('T2', 6, 5, 10, 'BC557');

sinewave('U2', 1, 0).v('10m').f(196);

var t = tran().run().chart('V(11)');
echo('Gain for 50k load', t.gain(1, 11).toFixed(3));

r7.r('2k2');
echo('Gain for 2k2 load', tran().run().gain(1, 11).toFixed(3));

r7.r('50k');
battery_sensitivity('U1', 1, 11, 0, 15).run().chart().last_chart.gif('bat_sens_french_amp.gif');