Hello AAC people
Stereo to mono jack mixing circuit
1 Figure 1 shows my quesion: It includes a wiring diagram that is common on the internet. I would like your opinion please on what the value of resistors R1 R2 and R3 should be. Or at least clues on how I can work them out myself?
2 I want to feed my smart phone earphone output to my guitar amp mono input. The guitar amp is specified here: http://www.ashtonmusic.com/products/amplification/item/ga10 (except my amp being an apparently older model does not have the “ipod ready” input.
3 I want to achieve this by wiring the 3.5mm input male jack to another 12.5mm output mono male jack with the summing/ mising box in between.
4 The value of the resistors is the big unknown for me. Some specifications for this on the internet seem to be based on the assumption the circuit is to be used to feed output from a stereo souce into head phones. I found an AAC forum question in which @#12 and @AnalogKid @KJ6EAD specified resistor values based on this function https://forum.allaboutcircuits.com/threads/stereo-headphone-jack-how-can-i-make-it-mono.115611/ see posts for example #24, #11 #25
5 I assume that part of the goal of having these resistors in the circuit is to protect the input circuitry (from shorting the stereo chanels) not just to protect the destination amp from being overpowered by the doubled voltage of the input signal. If so couldnt you put a diode in place of R3? Or maybe since we are dealing with AC(?) the diode wouldnt pass the other half of the signal. If so would this problem be insoluable, ncessiating the use of the resisotor(s)? Either way i dont want to ruin the audio amplifier in my smart phone!!
6 Does the summing box need to be shielded?
Thanks
Mellisa
Stereo to mono jack mixing circuit
1 Figure 1 shows my quesion: It includes a wiring diagram that is common on the internet. I would like your opinion please on what the value of resistors R1 R2 and R3 should be. Or at least clues on how I can work them out myself?
2 I want to feed my smart phone earphone output to my guitar amp mono input. The guitar amp is specified here: http://www.ashtonmusic.com/products/amplification/item/ga10 (except my amp being an apparently older model does not have the “ipod ready” input.
3 I want to achieve this by wiring the 3.5mm input male jack to another 12.5mm output mono male jack with the summing/ mising box in between.
4 The value of the resistors is the big unknown for me. Some specifications for this on the internet seem to be based on the assumption the circuit is to be used to feed output from a stereo souce into head phones. I found an AAC forum question in which @#12 and @AnalogKid @KJ6EAD specified resistor values based on this function https://forum.allaboutcircuits.com/threads/stereo-headphone-jack-how-can-i-make-it-mono.115611/ see posts for example #24, #11 #25
5 I assume that part of the goal of having these resistors in the circuit is to protect the input circuitry (from shorting the stereo chanels) not just to protect the destination amp from being overpowered by the doubled voltage of the input signal. If so couldnt you put a diode in place of R3? Or maybe since we are dealing with AC(?) the diode wouldnt pass the other half of the signal. If so would this problem be insoluable, ncessiating the use of the resisotor(s)? Either way i dont want to ruin the audio amplifier in my smart phone!!
6 Does the summing box need to be shielded?
Thanks
Mellisa