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Watt meter diy

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Watt meter diy
samuki Offline
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#1
08-10-2018, 08:53 PM (This post was last modified: 08-10-2018, 09:52 PM by samuki.)
Da li je neko pravio watt metar? 
Nasao sam ovu jednostavnu semu do 1kw, ali nemam ovaj ic , mozeli neki tranzistor kao zamjena? Poz


http://chemelec.com/Projects/Watt-Meter/Watt-Meter.htm


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Dackotronic Offline
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#2
08-10-2018, 10:42 PM
Mozda gresim ali ovo je sklop za merenje rmsa na analognu skalu ( koja doduse moze da se izbazdari u watima ) isti stvar moze da radi i unimer ili panelmetar , stim da posle napon pretvaras u wate.

Izlaz za "Complex load " je za opterecenje tj za otpor 4 ili 8 oma vise desetina wati.
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Dackotronic Offline
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#3
08-10-2018, 11:24 PM
Kad smo vec kod watt metra ...

Imamo ove Danotherm zicane otpornike , otpor im je 18 oma , ovo GRI 200 je valda 200w pretpostavljam , jer nisam uspeo da nadjem neke preciznije informacije o njima na netu .


Oni jesu induktivni ( cim su zicani ) ali induktivnost po otporu je 4.9uH , kada spojim dva paralelno induktivnost padne na nesto malo iznad polovine tipa 2.7uH .


Razmisljao sam da ih vezem 4 komada paralelno , time bih dobio 9 oma oko 400w i 4.5 oma 800w izdrzljivosti , merio bih rms panelmetrom i slicno naravno preko diode + sa 4 kom u paraleli induktivnost bi im jos opala .
Slicnu spravu imam za rf i meri tacno .

Sad jeste ono 9 oma su 9 oma nisu 8 , 4.5 su 4.5 i t d ali opet bolje i ovo nego nista + mericu rms pa ce se racunati s tom impedansom ...

Saveti i predlozi dobrodosli  Cool
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samuki Offline
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#4
08-11-2018, 08:49 AM
Ovo bi trebalo biti na 220v Ac , da mjerim uredaje koliko koji trosi.
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Dackotronic Offline
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#5
08-11-2018, 11:52 AM
(08-11-2018, 08:49 AM)samuki Wrote: Ovo bi trebalo biti na 220v Ac , da mjerim uredaje koliko koji trosi.

109 he he a pitam se koji ce mu vrag onaj "shunt" prolupao sam nacisto , izvinjavam se  106
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samuki Offline
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#6
08-11-2018, 12:54 PM (This post was last modified: 08-11-2018, 12:55 PM by samuki.)
Gledajuci data od ic to je dvostruki tranzistor u jednom kucistu max 40v i 20ma!
Koji ima tranzistor takav?
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emiSAr Offline
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#7
08-11-2018, 01:11 PM
Upari dva BC tranzistora u TO-92 kucistu, na ravnu stranu namazi termopaste i sve obuhvati termobuzirom.-
Tako se sprezu ulazni tranzistori u diferencijalnom paru NF pojacala, a to sto hoces da pravis nije nista drugo nego
diferencijalno pojacalo.-
pOz
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samuki Offline
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#8
08-11-2018, 01:23 PM
Onda moze i bc547 samo sto je 100mA.
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branko tod Away
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#9
08-11-2018, 07:04 PM

Pogledaj stranu 17 http://www.ti.com/lit/an/snoa626b/snoa626b.pdf
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samuki Offline
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#10
08-11-2018, 09:08 PM
Jeste to je ista sema.
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