In article <32100F5C.CAD@cdc3.net> jj@cdc3.net "Jerard Johnston" writes:
> Does anyone know how to take a connection for an 8 ohm speaker (such
> as an earphone jack) and directly connect it to microphone input on
> something else? Any help is appreciated
Well, for a *direct* connection you just need wire ;-)
But...
---R1---+---C1---+ ----
| |
Spkr R2 R3 Mic Input
| |
--------+---C2---+-----
Say you have a 10V speaker output and a 100mV mic input and you want to
load the speaker output to simulate an earphone (say 100R), and the mic
input is high impedance. So...
R1 = 100R R2 = 1R approx 100:1 divider
R3 = 10k load and bleeder for Cs
C1 = C2 = 330nF DC blocking, approx 50Hz -> 10k
These values are very approx and don't forget that R1 could dissipate
up to 1W using the assumptions above.
Jenny
--
Mayes uk
Date: Tue, 13 Aug 96 08:42:00 GMT
Original Subject: Re: 8 ohm connection to mike input