Hi,
I am looking for some ideas for a very low parts solution to this problem I have.
I need my audio in a circuit to be grounded until power hits full 24V.
If audio turns on at 23V, it doesn't work.
The dc-dc converter feeding it is pretty precise so always reads 24V to possibly 24.4V
So, I'm thinking relay is my best choice?
However, I'm not sure on the best way to achieve this.
The relay I'm looking at starts at 18V it states (not sure how precise this would be?)
If it was precise each time and doesn't change, then maybe I could use a trim pot in series before it and drop the precise
voltage before it, so it only starts when 24V hits. Is this a stupid idea? Seems very hit and miss to me but I can but hope!
I mean, maybe if that isn't a good idea, I could consider a low current delay circuit to just start say 20 sec after turn on (Usually takes psu around 6 sec to reach 24V) would be sufficient.
Some other things I am trying to achieve is very low current. (as thats the reason for this problem)
Thinking about a 24V relay with 2880 coil resistance.
Also space is at a premium. Relay I'm looking at is tyco 10mm x 6mm x 5.65mm
Thanks for any help or inspiration you can give.
Nothing in life is simple hey!
PS. The reason for this problem, I have a mic pre which is running on DC converter with a very limited psu. So my
current available is minimal. Because of inrush current, if the audio is ungrounded it causes the converter to draw
more current and as such it never reaches full power. However, if the audio is grounded and switched on (with a temporary
switch for now) after power reaches 24V it works fine.
I am looking for some ideas for a very low parts solution to this problem I have.
I need my audio in a circuit to be grounded until power hits full 24V.
If audio turns on at 23V, it doesn't work.
The dc-dc converter feeding it is pretty precise so always reads 24V to possibly 24.4V
So, I'm thinking relay is my best choice?
However, I'm not sure on the best way to achieve this.
The relay I'm looking at starts at 18V it states (not sure how precise this would be?)
If it was precise each time and doesn't change, then maybe I could use a trim pot in series before it and drop the precise
voltage before it, so it only starts when 24V hits. Is this a stupid idea? Seems very hit and miss to me but I can but hope!
I mean, maybe if that isn't a good idea, I could consider a low current delay circuit to just start say 20 sec after turn on (Usually takes psu around 6 sec to reach 24V) would be sufficient.
Some other things I am trying to achieve is very low current. (as thats the reason for this problem)
Thinking about a 24V relay with 2880 coil resistance.
Also space is at a premium. Relay I'm looking at is tyco 10mm x 6mm x 5.65mm
Thanks for any help or inspiration you can give.
Nothing in life is simple hey!
PS. The reason for this problem, I have a mic pre which is running on DC converter with a very limited psu. So my
current available is minimal. Because of inrush current, if the audio is ungrounded it causes the converter to draw
more current and as such it never reaches full power. However, if the audio is grounded and switched on (with a temporary
switch for now) after power reaches 24V it works fine.