E-design said:D1 and C5 will be in series and in parallel to L2. Plots done on 2 different simulators Multisim and Genesys. BTW LTspice shows the same instability
FvM said:Where did you get your knowledge about the varcap pin assignment? If it's the same type, that I
have in my drawer, then the two opposite pins (A + C) are connected to the rotor - and should be
grounded. It looks very much like a part that's now made by Vishay:
https://www.vishay.com/doc?28526 (Originally produced by Roederstein or Philips, I think).
Also without a datasheet, a quick view from the downside reveals the internal connection.
P.S.: It's been Philips Components series 2222 808
please tell me which pins will be inputs and which pin should be connected to ground in trimmers..plz dont confuse me..
Are A and C the two terminals of the trimmer and wat is B pin given..?FvM said:C3 is rather is series with C4 and C5, at least it's also influencing the resonance frequency. The problem
arises by introducing more frequency determining capacitors then necessary. The basic circuit (a common
collector colpitts oscillator) doesn't have that much capacitors.
You can simplify the calculation by making the C3 capacitance considerably higher, e.g. > 1 nF. But's not an
actual problem, I think.
P.S.:
please tell me which pins will be inputs and which pin should be connected to ground in trimmers..plz dont confuse me..
Calm down, read the above linked datasheet. A capacitor hasn't in- or output, just two terminals. In
case of a varcap, it's useful to ground the rotor, if ever possible, for the reason betwixt explained.
Check which pins connect to the rotor and use them accordingly.
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