Here you can find a collection of electric and electronic circuits realized by the PSpice tool or by Cadence ORCAD Capture Lite.
You can freely download, use or modify all the stuff you'll find here.
Anyone who wishes to collaborate and share his experience, i invited to send, his works.
OrCAD 17.2 PSpice Designer Lite Software, it's freely downlonable, after registation,
here
PSpice is a free open source software, download it
here
Multiplexer and Demultiplexer (ORCAD Capture Lite)
Data trasmission by MUX and DEMUX
ENABLE and ENABLE-mux are two "STIM1" set to 0 (COMMAND0 = 0s 0) to enable the A inputs of the double DEMUX 74153 and the 2Y outputs of the double MUX 74155
Data enter the demultiplexer in parallel (I0; I1; I2; I3);
are trasmitted in series to the multiplexer that reset them in parallel to the outputs (2y0; 2Y1; 2Y2; 2Y3).
S0; S1 send the sequence:
00 01 10 11
to the MUX and DEMUX selectors, to enable I0 and 2Y0, then I1 and 2Y1, ...
to direct data correctly.
Phase-shift oscillator
Phase-shift oscillator by RC feedback
In this circuit the inverting Op-Amp has a negative feedback due by a series of 3 cascade RC cells. The Op-Amp determines a 180° phase shift The oscillation starts at the frequency that causes a phase shft in the three cells equal to 180°, infact, in observance of the Barkhausen criterion, the sum of the phase shifts along the ring must be zero.
Hartley oscillator
Hartley oscillator oscillation frequency
The oscillation frequency is given by:
With the given values (Cr=2.2nF, Lr1=850nH, Lr2=150nH)
the result is: fr=3.39MHz. In the simulation the frequency is fr=3.38MHz
as is possible to see from the spectrum ('FFT' key in plot window) or from the image 'andamento3' here below.
Per informazioni, segnalazioni od invio materiale: rdr@erredierre.it