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11 votes
Accepted

Issues with ICL7660 ICs from eBay - Overheating and Failure

It's possible they are bad. Your photo shows an ICL7660S which is a different part (some improved characteristics, including a 12V rating) from the ICL7660 and ICL7660A. The logo and markings are ...
Spehro Pefhany's user avatar
7 votes
Accepted

Part name of this IC - Analog Devices, 8-pin, "S 6B" A 06" "C 42"

Marking "S6B" : ADG721BRM Marking "A06" : AD8629ARMZ Marking "C42" : AD7787BRMZ pictures from LCSC:
vivier's user avatar
  • 1,093
4 votes
Accepted

Part name of this IC - "LLA#537"

Without knowing any more than what is in the post, like dimensions and surrounding circuitry; It's likely to be an Analog Devices ADP3334ACPZ, High Accuracy, Low IQ, anyCAP® Adjustable Low Dropout ...
MrGerber's user avatar
  • 1,290
2 votes

Is it correct to apply KVL through the 2 inputs of an op amp?

Negative feedback causes the op-amp to adjust its output potential to whatever is necessary to equalise its two input potentials. That's the principle behind the "virtual ground" you read ...
Simon Fitch's user avatar
  • 38.4k
1 vote

Is it correct to apply KVL through the 2 inputs of an op amp?

It's not KVL that makes the voltages across each pair of differential inputs zero, it's an effect of negative feedback and extremely high gain. It's also an approximation only and is invalid if the op-...
Spehro Pefhany's user avatar
1 vote

Issues with ICL7660 ICs from eBay - Overheating and Failure

Since you bought from ebay, it's most likely either fake parts or parts which didn't pass testing. Throw them out and buy from any reputable supplier.
kingtaco's user avatar
1 vote
Accepted

What is the maximum dBu I can send into a microphone input in this schematic?

The op-amp is powered from 5V and has rail-to-rail output, guaranteed to be 4Vpp. We can assume ideal 5Vpp for simplicity. It is an inverting configuration, with gain of 20.6, which means the op-amp ...
Justme's user avatar
  • 158k
1 vote

What is the maximum dBu I can send into a microphone input in this schematic?

The circuit has external input overvoltage clipping diodes, but we need to see more of the schematic to evaluate them in this circuit. Here is something to consider . . . The opamp circuit is ...
AnalogKid's user avatar
  • 21.2k

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