EMRFD Message Archive 6708

Message Date From Subject
6708 2011-09-27 15:49:21 Bradford Voltage regulator Ci and Co capacitors what kind??

Hello to all in the group. I apologize for bothering the group with a question of this caliber,but I have looked everywhere and have not been able to find the answer.I am looking to use a L7806 voltage regulator, I know the values are Ci = .33uf and Co = .1uf. My question is what type of caps should these be?? Vi will be 9vdc - 13.8vdc.
Thank you very much.
Brad N1VWD

6709 2011-09-27 16:23:15 NeilDouglas Re: Voltage regulator Ci and Co capacitors what kind??

Brad,

I would use 50V axial or disc ceramic capacitors, mount them with short
leads as close to the regulator pins as you can.

NeilD

G4SHJ

_____

6710 2011-09-27 16:25:04 Dan Mills Re: Voltage regulator Ci and Co capacitors what kind??

On Tue, 2011-09-27 at 22:49 +0000, Bradford wrote:

> I am looking to use a L7806 voltage regulator, I know the values are
> Ci = .33uf and Co = .1uf. My question is what type of caps should
> these be?? Vi will be 9vdc - 13.8vdc.
> Thank you very much.

Pretty much anything will do, I usually use jelly bean ceramics (X7R or
similar, whatever is in the junk box), if supply leads are long a 10uF
electrolytic in parallel with the input ceramic does not hurt any.

Regards, Dan.

6711 2011-09-28 05:05:40 Bradford Re: Voltage regulator Ci and Co capacitors what kind??

6712 2011-09-28 06:08:37 KF4BQ Re: Voltage regulator Ci and Co capacitors what kind??

> .I am looking to use a L7806 voltage regulator, I know the values are Ci = .33uf and Co = .1uf. My question is what type of caps should these be?? Vi will be 9vdc - 13.8vdc.

Hi Brad,

Some regulators require input/output capacitors to be in a specific ESR range for stability. The L7806 doesn't have this restriction. When not restricted: I would use cheap ceramic X7R or other capacitor type. Probably anything will work without troubles.

Have fun, Mike Collins KF4BQ

6713 2011-09-29 09:19:46 ha5rxz Re: Voltage regulator Ci and Co capacitors what kind??

Using cheap ceramic capacitors anywhere in a circuit can result in interesting problems with microphonics. Best avoid them if you can.

Peter HA5RXZ

6708	2011-09-27 15:49:21	Bradford	Voltage regulator Ci and Co capacitors what kind??
Message	Date	From	Subject
Hello to all in the group. I apologize for bothering the group with a question of this caliber,but I have looked everywhere and have not been able to find the answer.I am looking to use a L7806 voltage regulator, I know the values are Ci = .33uf and Co = .1uf. My question is what type of caps should these be?? Vi will be 9vdc - 13.8vdc. Thank you very much. Brad N1VWD
6709	2011-09-27 16:23:15	NeilDouglas	Re: Voltage regulator Ci and Co capacitors what kind??
Brad, I would use 50V axial or disc ceramic capacitors, mount them with short leads as close to the regulator pins as you can. NeilD G4SHJ _____
6710	2011-09-27 16:25:04	Dan Mills	Re: Voltage regulator Ci and Co capacitors what kind??
On Tue, 2011-09-27 at 22:49 +0000, Bradford wrote: > I am looking to use a L7806 voltage regulator, I know the values are > Ci = .33uf and Co = .1uf. My question is what type of caps should > these be?? Vi will be 9vdc - 13.8vdc. > Thank you very much. Pretty much anything will do, I usually use jelly bean ceramics (X7R or similar, whatever is in the junk box), if supply leads are long a 10uF electrolytic in parallel with the input ceramic does not hurt any. Regards, Dan.
6711	2011-09-28 05:05:40	Bradford	Re: Voltage regulator Ci and Co capacitors what kind??

6712	2011-09-28 06:08:37	KF4BQ	Re: Voltage regulator Ci and Co capacitors what kind??
> .I am looking to use a L7806 voltage regulator, I know the values are Ci = .33uf and Co = .1uf. My question is what type of caps should these be?? Vi will be 9vdc - 13.8vdc. Hi Brad, Some regulators require input/output capacitors to be in a specific ESR range for stability. The L7806 doesn't have this restriction. When not restricted: I would use cheap ceramic X7R or other capacitor type. Probably anything will work without troubles. Have fun, Mike Collins KF4BQ
6713	2011-09-29 09:19:46	ha5rxz	Re: Voltage regulator Ci and Co capacitors what kind??
Using cheap ceramic capacitors anywhere in a circuit can result in interesting problems with microphonics. Best avoid them if you can. Peter HA5RXZ