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Silvo
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Pridružen-a: Pon 24 Feb 2003 17:09
Prispevkov: 14679
Aktiv.: 61.79
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 Objavljeno: Pon Feb 07, 2005 11:53 am Naslov sporočila: Kako izvesti napajanje ICL7106 |
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Sporočilo se sicer nanaša na LM35. Doma imam LCD modulček V-metra narejenega po tipični aplikaciji. Želel bi narediti baterijsko napajan termometer. Kako izvesti napajanje senzorja ter mudulčka z enim virom. Podoben problem se poraja recimo pri usmerniku. Kako iz istega vira, ki ga želimo meriti napajati IC  . (problem pri celi zadevi je masa (-) ki je za napajanje ter meritev na različnem potencialu. (Še tole - ne potrebujem negativnega prikaza)
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lp
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Iztok
Član
Pridružen-a: Pet 08 Okt 2004 0:55
Prispevkov: 4974
Aktiv.: 20.94
Kraj: LJ
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| Objavljeno: Pon Feb 07, 2005 12:59 pm Naslov sporočila: |
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Converting a 9V DPM to a 0-2V Ground-Referenced DPM
Shown below is a circuit that will convert any "floating differential" (9-volt powered) 200 mV DPM into a ground-referenced 2-volt unit! It will allow you to use such a meter (commonly available) with any of the thermometer circuits presented above (except the fridge controller -- the higher supply voltage will damage the 9-volt DPM). A single battery may be used to power both the thermometer *and* the converter/DPM. It too requires some calibration but that is straightforward if you have access to an accurate DVM. First, short the input terminals and adjust the "COLD" pot so the meter reads zeros. Now apply any voltage up to 1.999 volts DC, as measured with your DVM, and adjust the "HOT" pot so that the panel meter reads the same as the DVM. Recheck your zero and repeat adjustment as needed, although you probably won't have to.
If you attach an LM34 or LM35 directly to the converter circuit, add a 1K to 5.6K resistor across the converter input terminals. The LM34 / 35 would rather "supply" current than "absorb" it; false readings occur without the extra load resistor. Added battery drain is minimal.
By the way, if you want to use an LM34 or LM35, you can use the cheaper "D" grade and calibrate the converter using hot and cold water and a reference thermometer. This will give you accuracy comparable to the better grades at far less cost. |
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reber
Član
Pridružen-a: Pon 26 Maj 2003 12:20
Prispevkov: 2279
Aktiv.: 9.59
Kraj: Bled
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| Objavljeno: Pon Feb 07, 2005 1:14 pm Naslov sporočila: |
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Če prav vem, ima ICL7106 možnost, da ga napajaš z 9V baterijio direktno na V+ in V- , masa pa je potem nekako plavajoča, ni priključena na napajanje.
To je v data sheet. Nisem pa čisto siguren v to, ker nikoli nisem prakticiral z baterijo. |
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