Hi Guys,
Rectifiers - caps - regulators- getting hot...
I have built an external power supply for a multi channel micpre. Everything is working fine, sounds fine etc... I just have a few questions concerning the heating up of some of the parts in the power supply.
4 voltages +/-15vdc - 12vdc - 48vdc.
Each supply works approximately the same way-
1. Transformer feeds -
2. RB153 1.5A 150c max rectifier.
3. CRC 1000uf-10R-1000uf.
4. LM317/ 337 (well heatsinked/compound)
The main issue (might be non-issue)
The 12vdc supply under 500mA load heats up the RB153 rectifier to my guess of "HOT!" The kinda hot where your finger hurts after 3-5 seconds and you feel the NEED to remove it. At lower loads it doesn't heat as much... duh.
I didn't bother to measure the exact temperature, because I'm sure it's not the 150c it says it can run, and I know it's not the 1.5A it says it can do.
I have built many power supplies using the little 1.5A rectifiers, never pulled more than 50mA, so it doesn't surprise me it's getting hot, just first timer questions... Thoughts?
The CRC capacitors are running warm to WARM! as well, Panasonic FC, with 2A ripple. The upstream (of the 10R ) cap seems to run twice as warm. It seems like the should be splitting the heat(?) maybe take the 10R out and run them in true parallel?
The +/-15vdc supplies are running about 50-60c under a load of 250mA per side
So, really my main question on all this is how to measure/concern yourself with heat.
Rectifiers - caps - regulators- getting hot...
I have built an external power supply for a multi channel micpre. Everything is working fine, sounds fine etc... I just have a few questions concerning the heating up of some of the parts in the power supply.
4 voltages +/-15vdc - 12vdc - 48vdc.
Each supply works approximately the same way-
1. Transformer feeds -
2. RB153 1.5A 150c max rectifier.
3. CRC 1000uf-10R-1000uf.
4. LM317/ 337 (well heatsinked/compound)
The main issue (might be non-issue)
The 12vdc supply under 500mA load heats up the RB153 rectifier to my guess of "HOT!" The kinda hot where your finger hurts after 3-5 seconds and you feel the NEED to remove it. At lower loads it doesn't heat as much... duh.
I didn't bother to measure the exact temperature, because I'm sure it's not the 150c it says it can run, and I know it's not the 1.5A it says it can do.
I have built many power supplies using the little 1.5A rectifiers, never pulled more than 50mA, so it doesn't surprise me it's getting hot, just first timer questions... Thoughts?
The CRC capacitors are running warm to WARM! as well, Panasonic FC, with 2A ripple. The upstream (of the 10R ) cap seems to run twice as warm. It seems like the should be splitting the heat(?) maybe take the 10R out and run them in true parallel?
The +/-15vdc supplies are running about 50-60c under a load of 250mA per side
So, really my main question on all this is how to measure/concern yourself with heat.