A friend gave me this small (passive ) ? mixer. It has a broken resistor. Can anyone tell me what resistor would make this work and where to solder all the wires. regards to all.

 

Could be 1.3K, 3.3K, 10%, have you got the bit that's missing from the resistor?

 

A friend gave me this small (passive ) ? mixer. It has a broken resistor. Can anyone tell me what resistor would make this work and where to solder all the wires. regards to all.

There really isn't much to a passive summer and quite frankly I wouldn't use a capacitor at all in the circuit. The only thing you are missing is the summing resistor so I see no use for the board. You need to terminate it somewhere 5 to 10 times the feed resistor value..

 

hello,

it looks like the broken resistor is connected to the transistor.
the value could be 3k3 as @Dodgydave mentioned.

bertus

 

hello,

it looks like the broken resistor is connected to the transistor.
the value could be 3k3 as @Dodgydave mentioned.

bertus

Thank you..best wishes.

 

There really isn't much to a passive summer and quite frankly I wouldn't use a capacitor at all in the circuit. The only thing you are missing is the summing resistor so I see no use for the board. You need to terminate it somewhere 5 to 10 times the feed resistor value..

Thank you..best wishes

 

Given the resistor is a 10% tolerance variety, the only reasonable 10% value will be 3 3x 100 (orange orange red ) Wy do we not get a component side view of the whole PCB? How else can we trace out the circuit???? Because we will need the whole circuit to know where to attach all of thw wires.

 

It is a x.3 K resistor, most likely 3.3 K, 10%, as @Dodgydave mentioned.

 

Unlikely to be 1.3k as it is 10% tolerance, and 1.3k is E24.

 

As for making it work as a mixer with a bit of gain to overcome the mixing losses, one big question comes to my mind:
What will the application be?? Mixing microphones? Or a tape deck and a microphone? Or recording a group of singers using multiple microphones?? The mixing ability you need depends quite a bit on what you are going to use it for.
AND, if it happens that you will be using it with microphones that use XLR connectors, it is totally the wrong one.