initial test of a modulated PT2399 circuit…

a breadboard version of some PT2399 modifications i’ve been working on. there are a lot of DIY schematics that utilize the PT2399 (Magnus Modulus, Echo Base delay, Rebote, etc.). i’ve been interested at trying my hand at modulation techniques recently. i made a simple LFO circuit based on the findings mentioned in a previous post. i used some techniques out lined in some of the schematics floating out there to attempt to modulate the delay time of the chip. i wouldn’t say i’ve got it to work perfectly, but it’s definitely doing what i had hoped.

ngSpice: single frequency FM modulated signal generation

ever wanted to see how that 2N2222 might hold up as a linear RF amplifier? here’s a handy feature of ngSpice that i found recently. i’m rather new to ngSpice and at first was somewhat frustrated by its differences from other SPICE variants. however, i’ve earned a deep appreciation for it and its integration with the gEDA suite.

V1 n1 0 sffm(2 24 10k 5 1k)
.tran 0.01ms 2ms
.plot n1

the above code generates the waveform seen above. the corresponding values in the sffm() function run something like this.

Parameters Default value Unit
Vo (offset) Ampere or Volt
Va (amplitude) Ampere or Volt
Fc (carrier frequency) 1/Tstop Hz (Hertz)
Mi (modulation index)
Fs (modulation frequency) 1/Tstop Hz (Hertz)