Hello, 8A423 code is this part a 78L33 regulator? I've researched it but I'm not sure. According to the data, it doesn't seem like a regulator; I'm assuming it's an NPN transistor. However, when I apply 9 volts, it gives 3.3 volts, behaving like a 78L33. But when I connect it to the input of my circuit, the diode and 47-ohm resistor get hot enough to burn out. Therefore, I don't think it's a 78L33, but the seller sent me one. Could I be wrong? I respect your opinions.
Voltage regülatör
- Thread starter serhay
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I'm sure it's not 78L33. Is that correct?
The problem is, I want to confirm if this part is the right one or the wrong one. Is it a regulator transistor or a regular transistor? My circuit requires a 78L33, but I installed this part and there's a problem, so I wanted to make sure it's not a 78L33.
pricklyrobot
Well-known member
SMD code ID site says it’s a Torex XC6111a423, which is a “voltage detector”.
Probably not a part that’s going to be called for in a pedal.
Probably not a part that’s going to be called for in a pedal.
Can confirm, that's all I found as well, but footprint doesn't match. BA prefix is usually Phillips/Onsemi iirc, but no match there. More likely a random piece of chinesium and if that's the case, who knows.
pricklyrobot
Well-known member
If it was something in the audio path, I’d say go ahead and experiment. I understand the ‘I’m one part short, but I really want to finish this today!!’ feeling.
But for something like a voltage regulator there’s an excellent chance slapping the wrong one in there is going to fry other correct, working components downstream.
Just order the correct regulator (and maybe a few spares for your parts drawer) from a reputable supplier, and work on something else until it shows up.
If you’re any kind of DIYer worth your salt, you will have at least 10 other half-finished projects sitting around
But for something like a voltage regulator there’s an excellent chance slapping the wrong one in there is going to fry other correct, working components downstream.
Just order the correct regulator (and maybe a few spares for your parts drawer) from a reputable supplier, and work on something else until it shows up.
If you’re any kind of DIYer worth your salt, you will have at least 10 other half-finished projects sitting around
Robert
Reverse Engineer
It's hard to say 100% with confidence..... It could be some form of 3.3V regulator, but if it's getting hot without an excessive load something is wrong.
Either it is not a regulator, can't handle 9V input, can't handle the current requirement of the FV-1, the pinout is different from the 78L33, or it's defective...
The SMD code can point to many different devices, it's difficult to say which one it is with nothing more to go on.
If it's getting hot and there's nothing else wrong with the circuit then it's not a healthy 78L33, no.
Either it is not a regulator, can't handle 9V input, can't handle the current requirement of the FV-1, the pinout is different from the 78L33, or it's defective...
The SMD code can point to many different devices, it's difficult to say which one it is with nothing more to go on.
If it's getting hot and there's nothing else wrong with the circuit then it's not a healthy 78L33, no.
Robert
Reverse Engineer
Found it.
Yes, 8A is the marking for the ST L78L33ACUTR
So now you need to determine if the problem is the circuit or the regulator...
Yes, 8A is the marking for the ST L78L33ACUTR
So now you need to determine if the problem is the circuit or the regulator...
8A423, you're saying it's definitely a 78L33?
