Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Rf pojacalo
#25
Taj detektor ima neki naponski prag pri kome počinje da radi i vezan je za zaporni napon upotrebjene diode.

1N4148 je klasična Si dioda koja počinje da provodi tek od nekih 0.5V, sve ispod toga taj detektor "neće da vidi".
Preko 0.7V (Vpp) ta dioda počinje da radi "normarno i linearno".

Nekada su se za te svrhe koristile Germaniumske diode koje počinju da rade od nkih 0.15Vpp i bile su limitirane za relativno niske frekvencije, recimo za HF opseg do 30-ak MHz.
Teško se nalaze sada takve diode.

Kompromisno rešenje je upotreba Schotky dioda, one imaju manji zaporni napon, reda oko 0.2Vpp, neka iz serije BAT-2x, BAT-4x.

U svakom slučaju pokušavaš da izmeriš nešto što je ispod praga provodjenja upotrebljenih dioda, zato ne pokazuje ništa.
Reply


Messages In This Thread
Rf pojacalo - by samuki - 06-15-2024, 08:26 PM
RE: Rf pojacalo - by samuki - 06-15-2024, 08:27 PM
RE: Rf pojacalo - by samuki - 06-16-2024, 11:24 AM
RE: Rf pojacalo - by PeceMK - 06-16-2024, 11:33 AM
RE: Rf pojacalo - by gorso69 - 06-16-2024, 01:54 PM
RE: Rf pojacalo - by ddanijel - 06-16-2024, 10:10 PM
RE: Rf pojacalo - by samuki - 06-16-2024, 10:20 PM
RE: Rf pojacalo - by ddanijel - 06-17-2024, 12:15 AM
RE: Rf pojacalo - by mikikg - 06-17-2024, 12:35 AM
RE: Rf pojacalo - by ddanijel - 06-17-2024, 12:00 PM
RE: Rf pojacalo - by samuki - 06-17-2024, 12:48 PM
RE: Rf pojacalo - by samuki - 06-17-2024, 12:56 PM
RE: Rf pojacalo - by yugaja - 06-17-2024, 02:46 PM
RE: Rf pojacalo - by ddanijel - 06-17-2024, 06:23 PM
RE: Rf pojacalo - by samuki - 06-17-2024, 07:42 PM
RE: Rf pojacalo - by mikikg - 06-17-2024, 11:49 PM
RE: Rf pojacalo - by mikikg - 06-18-2024, 12:34 AM
RE: Rf pojacalo - by ddanijel - 06-18-2024, 12:33 PM
RE: Rf pojacalo - by samuki - 06-18-2024, 12:59 PM
RE: Rf pojacalo - by mikikg - 06-18-2024, 11:38 PM
RE: Rf pojacalo - by progster - 06-19-2024, 10:47 AM
RE: Rf pojacalo - by ddanijel - 06-19-2024, 12:12 PM
RE: Rf pojacalo - by yugaja - 06-19-2024, 12:22 PM
RE: Rf pojacalo - by samuki - 07-22-2024, 05:32 PM
RE: Rf pojacalo - by mikikg - 07-26-2024, 12:15 PM
RE: Rf pojacalo - by samuki - 07-27-2024, 08:52 PM
RE: Rf pojacalo - by mikikg - 07-28-2024, 03:18 PM
RE: Rf pojacalo - by samuki - 07-28-2024, 08:38 PM
RE: Rf pojacalo - by samuki - 07-28-2024, 08:52 PM
RE: Rf pojacalo - by emiSAr - 07-29-2024, 12:01 PM
RE: Rf pojacalo - by samuki - 07-29-2024, 08:26 PM
RE: Rf pojacalo - by Omegakg - 08-04-2024, 09:22 PM
RE: Rf pojacalo - by samuki - 08-24-2024, 12:52 PM
RE: Rf pojacalo - by samuki - 08-24-2024, 12:54 PM
RE: Rf pojacalo - by samuki - 08-24-2024, 12:54 PM
RE: Rf pojacalo - by samuki - 08-24-2024, 12:56 PM

Forum Jump:


Users browsing this thread: 1 Guest(s)