Hi, we all know that the LM317/LM337 are certainly not bad, at least better than 78XX and 79XX.
I have the those three legged regulators in my DAC (set to 15V), with quite little space around. Audiophonics have this: https://www.audiophonics.fr/en/voltage-regulator/lt3045-linear-voltage-regulator-15v-p-17097.html, but the connecting is not compatible as they are more for a 7815 direct replacement.
Is there anything similar with the LM pinout, maybe to be set with the existing trimmer, or a fixed output and I remove the trimmer?
Thanks
- dan
I have the those three legged regulators in my DAC (set to 15V), with quite little space around. Audiophonics have this: https://www.audiophonics.fr/en/voltage-regulator/lt3045-linear-voltage-regulator-15v-p-17097.html, but the connecting is not compatible as they are more for a 7815 direct replacement.
Is there anything similar with the LM pinout, maybe to be set with the existing trimmer, or a fixed output and I remove the trimmer?
Thanks
- dan
What exactly do you hope to accomplish with the change? Have you looked at Elvee's thread on improving noise performance of these regulators? Applies equally to LM337.
https://www.diyaudio.com/community/...-retrofit-upgrade-any-317-based-v-reg.331491/
https://www.diyaudio.com/community/...-retrofit-upgrade-any-317-based-v-reg.331491/
The trick I've found with these 3 pin regs is to make sure they're "turned on". That means you need current flowing to get good noise rejection and PSRR. Linearity acorss the entire frequency spectrum is important so the reg doesn't highlight any higher impedance areas favorably and therefore doesn't add anything non linear in the entire frequency range. Shunting with a low noise CCS improves performance by a large margin. Again, both the vreg and CCS need to behave as linear as possible across the whole audio bandwidth.
1. It depends on what you mean by better. There are switch-mode replacements that handle more power with less heat. There are high voltage models if your raw input is more than 40V.
2. If you want better regulation or noise, you need to forget 3-terminal regulators, or apply LV's noise canceler.
3. LM317 and LM337 are designed to be flexible, so they are not as good a regulator as fixed voltage parts.
4. Most op-amps have great PSRR and don't actually need a regulated supply, so LM317, LM337, 7815, 7915 are plenty good enough unless you mess up the AC loading making them oscillate.
5. Beware that the audio market is like the automotive bolt-on market, selling parts that are lucky if they perform as well as the OEM parts. The original designer knew what they were doing. Otherwise, you would have built it yourself instead of buying his.
2. If you want better regulation or noise, you need to forget 3-terminal regulators, or apply LV's noise canceler.
3. LM317 and LM337 are designed to be flexible, so they are not as good a regulator as fixed voltage parts.
4. Most op-amps have great PSRR and don't actually need a regulated supply, so LM317, LM337, 7815, 7915 are plenty good enough unless you mess up the AC loading making them oscillate.
5. Beware that the audio market is like the automotive bolt-on market, selling parts that are lucky if they perform as well as the OEM parts. The original designer knew what they were doing. Otherwise, you would have built it yourself instead of buying his.
Well my DAC has the LM317/337 combo and it sounds good, but always looking for perfection and see with if the sounds improves with a change. So far looks like the LT1033 and LT1085 mentioned by m4lve lover are an easy match to try.
Thanks everybody
Thanks everybody
As mentioned above, the Elvee mod (ps://www.diyaudio.com/community/...-retrofit-upgrade-any-317-based-v-reg.331491/) will do FAR more than any three-pin substitute. Plus, it's inexpensive, small, and generally can be retrofitted into any existing design.
