active_envelope_follower_am.ngjs

#!/usr/bin/env ngspicejs
// Active envelope follower (AM signal)
// linter: ngspicejs-lint
"use strict";

battery('U1', 5, 0, 9);
resistor('R1', 5, 4, '47k');
resistor('R2', 5, 6, '4k7');
resistor('R3', 6, 0, '50k');
capacitor('C1', 3, 2, '10u');
capacitor('C2', 6, 0, '22u');
diode('D1', 4, 2, '1N4148');
diode('D2', 6, 4, '1N4148');
npn('T1', 4, 2, 0, 'BC547');
am('U2', 3, 0).v(0.1).f(10).fc(200);

tran().interval('120m').run().chart(['V(3)', 'V(6)']);