Hi all
this is my first post so be kind! lol
Now, that being said, I'm not sure if this post is in the right thread, but my project is sort of a combination of two different components, preamp with volume control and headphone amps.
I've been trying to design a circuit that would allow me to switch off either the speaker output or the headphone output individually. Now, all my other equipment (EQ, Stereo Processor, etc) all has balanced inputs and outputs and I would like to keep that going.
First off, I've looked through several threads relating to balanced volume control and have seen the expense of acquiring high quality balanced attenuators. I've thought that maybe even though the LDR's can be expensive purchasing a suitable amount to look for matched pairs that I should put in a Lightspeed Attenuator circuit. For the schematic I'm attaching, I've doubled everything to create a balanced volume control although I'm not sure if it's theoretically sound... Can the dual pot control all 4 LDR's?
As for the headphone amps, I think that two CMoy amps will be sufficient to drive the two headphone outputs. Although, with the OPA2132 opamp powered with 5V, will perhaps only one CMoy amp be sufficient to power two headphone outputs wired in parallel? The headphones I want to drive are 55ohm impedance (AKG K240 Studio). The headphone outputs would each have their own potentiometer for volume although this alone probably gives me my answer since volume control typically goes before the amp. I'm not well versed in electronics so I'm not sure how to calculate that out or if I'm just being dumb lol.
Don't mind the relays currently shown in the schematic. I'm still trying to decide the best way to switch the outputs on or off.
Any input would be appreciated!
this is my first post so be kind! lol
Now, that being said, I'm not sure if this post is in the right thread, but my project is sort of a combination of two different components, preamp with volume control and headphone amps.
I've been trying to design a circuit that would allow me to switch off either the speaker output or the headphone output individually. Now, all my other equipment (EQ, Stereo Processor, etc) all has balanced inputs and outputs and I would like to keep that going.
First off, I've looked through several threads relating to balanced volume control and have seen the expense of acquiring high quality balanced attenuators. I've thought that maybe even though the LDR's can be expensive purchasing a suitable amount to look for matched pairs that I should put in a Lightspeed Attenuator circuit. For the schematic I'm attaching, I've doubled everything to create a balanced volume control although I'm not sure if it's theoretically sound... Can the dual pot control all 4 LDR's?
As for the headphone amps, I think that two CMoy amps will be sufficient to drive the two headphone outputs. Although, with the OPA2132 opamp powered with 5V, will perhaps only one CMoy amp be sufficient to power two headphone outputs wired in parallel? The headphones I want to drive are 55ohm impedance (AKG K240 Studio). The headphone outputs would each have their own potentiometer for volume although this alone probably gives me my answer since volume control typically goes before the amp. I'm not well versed in electronics so I'm not sure how to calculate that out or if I'm just being dumb lol.
Don't mind the relays currently shown in the schematic. I'm still trying to decide the best way to switch the outputs on or off.
Any input would be appreciated!
