clarification of the question:
1) Will there be problems in the differential signal due to imprecise resistors?
2) what value of R2 should be so that there are no problems due to a change in the input impedance of the amplifier?
1) Will there be problems in the differential signal due to imprecise resistors?
2) what value of R2 should be so that there are no problems due to a change in the input impedance of the amplifier?
A balanced attenuator would be better. Honestly, though: I would just hook the DAC to the amp and turn the volume control down by 12 dB. You can also configure the MOD186 for 20 dB gain. Then you only have to turn the volume down by 6 dB.
It's a common myth that the input sensitivity of the amp must be exactly matched to the output voltage of the source.
Tom
It's a common myth that the input sensitivity of the amp must be exactly matched to the output voltage of the source.
Tom
With the Modulus-186 and Modulus-286 I include the connectors and five pre-crimped leads for the power and speaker connections. I also include a small pouch of thermal grease (Wakefield 120).
Tom
Tom
Last call for Modulus-186. I have 12 modules left. Once they have sold the Modulus-186 will be discontinued.
The cost of assembly has increased by 43% over the past year. As result it no longer makes sense to keep the Modulus-186 going. Instead I will focus on the Modulus-286 and Modulus-686.
Tom
The cost of assembly has increased by 43% over the past year. As result it no longer makes sense to keep the Modulus-186 going. Instead I will focus on the Modulus-286 and Modulus-686.
Tom
Will the Modulus86 kit still be available? https://neurochrome.com/collections/power-amplifiers/products/modulus-86-stereo-kit
Oh, yes! The Modulus-86, Modulus-86 Stereo Kit, Modulus-286, and Modulus-686 will keep going.
Tom
Tom
I love collecting things that no longer exist.
Does anyone have these boards or assembly kits left?
Does anyone have these boards or assembly kits left?
The Modulus-186 has been discontinued. It was too expensive to produce. It was basically within a few bucks of the Modulus-286 to produce but there was no way I would be able to get near Modulus-286 prices for the 186.
I'm running low on Modulus-286 as well. I'll likely make more. I'll see if I can lower the production cost a bit so I don't have to raise prices so much for the next batch. Parts and assembly have gotten quite a bit more expensive since the last batch.
Tom
I'm running low on Modulus-286 as well. I'll likely make more. I'll see if I can lower the production cost a bit so I don't have to raise prices so much for the next batch. Parts and assembly have gotten quite a bit more expensive since the last batch.
Tom
I looked carefully. And the parameters of modulus 86 are much better than those of modulus 186. Is this correct?
The Modulus-86 Rev. 3.0 (current rev) has lower noise by a few dB than the Modulus-186 and, thereby, has lower THD+N. The IMD should be a smidge better too. The differences in the measurements reflect this and that I switched from the APx525 to the APx555 when the Modulus-86 Rev. 3 came out.
Tom
Tom
The Modulus-186 was a fully assembled module. So no assembly required (by you). If you need that experience, the Modulus-286 is where it's at: https://neurochrome.com/products/modulus-286
Tom
Tom