what's a better dropin replacement for a 7805?

jarthel · 10th June 2002, 12:31 PM

My CD player uses this voltage regulator and you may know a better substitute for it.

thanks for the reply.

Jayel

NickC · 10th June 2002, 01:34 PM

lt1086ct-5
5 volt regulator from linear tech
lt devices are good and lower in noise than the standard lm78** series as the lt devices are shunt regulated.
However the prices are expensive

jwb · 10th June 2002, 07:59 PM

related question: why does there not seem to be good negative analogs to the LT1086? The LT1185 seems close but then they seem to think of it as more of a current regulator than a negative voltage regulator. The LT1175 is nice but the max input is -20V. That probably isn't an issue for 5V rails but it's a problem in some situations. Linear has a huge range of nice positive regulators but nothing for negative.

Anyway i know the LT1085 is widely favored on this forum, but their RMS noise spec is the same as that for ye olde LM317.

I spent a long time trying to figure out what regulator i wanted to use in a low-current +/-18V supply for a recent project, before I finally said ****it and used 317/337 with ADJ bypassed. I figured there was no need to stress over the noise figures because the design is balanced and the power rail noise will get rejected at the next amplifier or downstream.

10th June 2002, 12:31 PM	#1
jarthel diyAudio Member Join Date: Jan 2002 Location: somewhere in Australia	what's a better dropin replacement for a 7805? My CD player uses this voltage regulator and you may know a better substitute for it. thanks for the reply. Jayel

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10th June 2002, 01:34 PM	#2
NickC diyAudio Member Join Date: Dec 2001 Location: Earth	lt1086ct-5 5 volt regulator from linear tech lt devices are good and lower in noise than the standard lm78** series as the lt devices are shunt regulated. However the prices are expensive

10th June 2002, 07:59 PM	#3
jwb diyAudio Member Join Date: Mar 2002 Location: San Francisco, USA	related question: why does there not seem to be good negative analogs to the LT1086? The LT1185 seems close but then they seem to think of it as more of a current regulator than a negative voltage regulator. The LT1175 is nice but the max input is -20V. That probably isn't an issue for 5V rails but it's a problem in some situations. Linear has a huge range of nice positive regulators but nothing for negative. Anyway i know the LT1085 is widely favored on this forum, but their RMS noise spec is the same as that for ye olde LM317. I spent a long time trying to figure out what regulator i wanted to use in a low-current +/-18V supply for a recent project, before I finally said ****it and used 317/337 with ADJ bypassed. I figured there was no need to stress over the noise figures because the design is balanced and the power rail noise will get rejected at the next amplifier or downstream.