Tube DIY Asylum

RE: Has anyone used LM317 as constant current source

108.45.150.12

Lew

In Reply to: RE: Has anyone used LM317 as constant current source posted by Leo loves music on April 08, 2025 at 20:14:21

Agree with all of the below. The late Allen Wright originally used an LM317 in his CCS sold as a kit. He later became completely disenchanted with the sound, and he attributed the negative results to the LM317. He informed owners of his kit to remove the part or bypass it. Obviously, this is hearsay.

Follow Ups:

RE: Has anyone used LM317 as constant current source - Leo loves music 18:50:27 04/10/25 (1)
LM317 is a 1.5A device. Its performance at 15mA is quite poor. See the above figure. LM317L is a 100mA device. It should be better t 15mA. It has a 65dB ripple rejection at 100kHz which is similar to 136k Ohm impedance.
- RE: Has anyone used LM317 as constant current source - JKT 14:01:28 04/11/25 (0)
  A cascode made from 8N100D2 MOSFETs will have an impedance in the audio band greater than 50Mohm. The impedance does decrease at 3dB/octave due to device capacitance.
  
  "It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln

Post a Followup:

FAQ

Post a Message!

Forgot Password?

Moniker (Username):
Password (Optional):
	Remember my Moniker & Password (What's this?) Eat Me
E-Mail (Optional):
Subject:

Message:	(Posts are subject to Content Rules)

Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:	Automagically notify you when someone responds.

To view your new posting or follow-up, click on the RELOAD or REFRESH button on your browser.

This post is made possible by the generous support of people like you and our sponsors:

Parts Connexion