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Hello,
I am interested in a project to take a stereo signal from a record needle cartridge and split the signal into a stereo amp and also a mono amp to be used at the same time (and independently with some switching). I have tried a couple of simple methods that negatively effected the stereo signal. I am thinking op amps might be a way to do this but I am unable to design this. Regardless of what method is used sharing your knowledge would be so greatly appreciated.
- Tom
Hi,
There are lots of ways to approach this, ranging from simplistic to complex : )
I don't know phono very well, but as I understand it may need a preamp first, with phone input, to sort out the cartridge response?
If so, then from the output of the stereo preamp, you could try adding a couple of resistors (perhaps 1 kohm might work) as shown in the sketch below, and just see what happens. It might be fine, or it might not, depending on the output and input capabilities of the preamp and the power amps respectively. But it's a (very low-cost) start, and if you're not happy with this then you could try something else.
A more advanced option would be to implement a proper mixer with controls. Yet another option could be to do it in DSP if you need the mono output to have a different response (e.g. low-pass for a bass response on that channel). That's not particularly difficult, but of course is a bit more of a major project compared to the two resistors.
Hi,
There are lots of ways to approach this, ranging from simplistic to complex : )
I don't know phono very well, but as I understand it may need a preamp first, with phone input, to sort out the cartridge response?
If so, then from the output of the stereo preamp, you could try adding a couple of resistors (perhaps 1 kohm might work) as shown in the sketch below, and just see what happens. It might be fine, or it might not, depending on the output and input capabilities of the preamp and the power amps respectively. But it's a (very low-cost) start, and if you're not happy with this then you could try something else.
A more advanced option would be to implement a proper mixer with controls. Yet another option could be to do it in DSP if you need the mono output to have a different response (e.g. low-pass for a bass response on that channel). That's not particularly difficult, but of course is a bit more of a major project compared to the two resistors.
