dustbro
Well-known member
PCB's are on the way. Anyone want to volunteer for beta testing?
EBay seems to have a sufficient supply.Martin Griffith said:What are you using for the input transistors? LM394's are quite obsolete. A quick search shows the Mat03 is on Last Time Buy at Digikey
dustbro said:EBay seems to have a sufficient supply.
Supposedly is the word. I don't see how a BiFET opamp with 10nV/sqrtHz noise voltage can replace an LM394 with 10 times less.Potato Cakes said:There is an older thread regarding replacing the LM394 and someone used 2 OPA2604's in its place with great results supposedly.
I would be very cautious about possible counterfeits, though.But dustbro is right, there are plenty LM394s on eBay.
abbey road d enfer said:Supposedly is the word. I don't see how a BiFET opamp with 10nV/sqrtHz noise voltage can replace an LM394 with 10 times less.
I would be very cautious about possible counterfeits, though.
abbey road d enfer said:I would be very cautious about possible counterfeits, though.
dustbro said:Very true... I just bought a boatload of LF351 from china, and they exploded in my circuit. TL081 worked fine
Who sez? Capacitor ratings are for continuous operation, and tolerate about +15% surges. Useful life of el caps is more dependant on temperature than voltage (as long as it's < than the rated voltage).Pusch3l said:I have to admit i just know from some articles that electrolytic caps likes to run at 75% of its max rating.
You're right, 63V is adequate for phantom isolation.After some basic math (yes i dont have much to do at work...) i ended up with a 63VDC max rating.
Hope i didnt get that wrong :
Whoops said:You can use MAT02EH instead of the LM394, it has better specs actually.
I buy MAT02EH from this source, fast shipping and never had a problem:
mary
Aosiwei Electronics Co.,Ltd
Tel: +86 -27-82848366 Fax: +86-27-82848466
E-mail: [email protected]
MSN: [email protected]
Website: www.aosiwei.com
abbey road d enfer said:Useful life of el caps is more dependant on temperature than voltage (as long as it's < than the rated voltage).
Overrated? yes... but I found them cheaper than 63V capsPusch3l said:Is the cap not a bit overrated with 100VDC?
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