I am putting together a laptop/projectioh system for my church.
This is going fine -- but I want to be able to provide audio from the laptop as well as vision!
The only input to my church sound system mixer is a microphone input.
(Very silly I know - but thats what is physically located where the laptop is ... and I cant change the other end easily).
So - I know very very little of the specifics of the spec of a typical laptop headphone output (not stated on data sheet of course) and also very little about microphone inputs.
Clearly I need to match levels and impedances (the distances are quite long).
I lookat the paticular mic I have and it is a Audio Technica AT857QMa.
I looked at the spec sheet and it appears to produce about half a volt and uses DC power from the mixer.
Anybody got a circut, or know of a piece of kit I can use to make this work easily?
This is going fine -- but I want to be able to provide audio from the laptop as well as vision!
The only input to my church sound system mixer is a microphone input.
(Very silly I know - but thats what is physically located where the laptop is ... and I cant change the other end easily).
So - I know very very little of the specifics of the spec of a typical laptop headphone output (not stated on data sheet of course) and also very little about microphone inputs.
Clearly I need to match levels and impedances (the distances are quite long).
I lookat the paticular mic I have and it is a Audio Technica AT857QMa.
I looked at the spec sheet and it appears to produce about half a volt and uses DC power from the mixer.
Anybody got a circut, or know of a piece of kit I can use to make this work easily?
You need to buy or make what is called a DI box. This matches impedance and converts to balanced to enable long cable runs. Oh, and if you buy, you will need to make an adaptor to 1/4 inch jack as well, as that is the input on most DI boxes.
Check out project 35 on the ESP website
Check out project 35 on the ESP website
Yeah mate this is every day AV staging stuff grab a DI box & away you go.
If you want the content of both audio channels you will either need to run 2 di boxes & 2 mic channels or I would recomend using two 1k resistors i series with the signal conductors to mix properly to mono.
I wouldn't bother buliding a di box these days they are so cheap.
cheers
If you want the content of both audio channels you will either need to run 2 di boxes & 2 mic channels or I would recomend using two 1k resistors i series with the signal conductors to mix properly to mono.
I wouldn't bother buliding a di box these days they are so cheap.
cheers
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.