Hey everyone,
First post here, so I hope I'm posting in the right section.
Anyway, I'm gathering parts for some upcoming console mods that I'll likely tackle this winter break.
NES-wise I want to do a stereo mod, but I was also reading that the stereo channels are a bit quiet, which is how I stumbled upon this:
A user on here made 2 of these, 1 for each audio channel, and I'm thinking about doing the same.
Parts-wise I noticed the schematic shows polar capacitors, but I wasn't able to find small rating capacitors that were polar. Is it just the schematic that's showing them polarized, but really it doesn't matter?
A quick picture I found of the NES motherboard makes me think the capacitors used aren't polarized:
I'll probably have more questions, but that's it for now.
Thanks!
Quick Question: NES Stereo Mod / Amplifier
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Re: Quick Question: NES Stereo Mod / Amplifier
Only the 1 and 10µF capacitors are polarized; the --|(-- notation doesn't necessarily imply polarized. (hence the extra +)
There's no particularly good reason to rebuild the entire NES-internal audio chain twice, as opposed to just using an opamp.
There's no particularly good reason to rebuild the entire NES-internal audio chain twice, as opposed to just using an opamp.
Re: Quick Question: NES Stereo Mod / Amplifier
I think the notation for a non-polar cap is --||--.
Re: Quick Question: NES Stereo Mod / Amplifier
A notation that's usually a non-polar cap is --||--
Only the visible + is a sign of something that's unambiguously polarized. A non-polarized cap can replace a polarized cap of similar ESR.
Only the visible + is a sign of something that's unambiguously polarized. A non-polarized cap can replace a polarized cap of similar ESR.
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Re: Quick Question: NES Stereo Mod / Amplifier
Thanks everyone! Yeah, I was looking at the --| |-- vs --) |-- notation as well; good tip pointing out that "+" to differentiate between polar and nonpolar.
And yeah, I'm sure the audio could be amplified using another method, but I do like the idea of replicating the original hardware, and I happen to have almost all the parts anyway due to other mods...
And yeah, I'm sure the audio could be amplified using another method, but I do like the idea of replicating the original hardware, and I happen to have almost all the parts anyway due to other mods...
Re: Quick Question: NES Stereo Mod / Amplifier
If you're removing the CIC at the same time, you could reuse one of the inverters in the 74HCU04 (since the CIC uses four; the audio amplifier here uses one; and the PPU uses one).
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Re: Quick Question: NES Stereo Mod / Amplifier
I have disabled the lockout chip (not 100% sure if that's the same as the CIC), so that is a thought; good idea!lidnariq wrote:If you're removing the CIC at the same time, you could reuse one of the inverters in the 74HCU04 (since the CIC uses four; the audio amplifier here uses one; and the PPU uses one).
Re: Quick Question: NES Stereo Mod / Amplifier
Yes, the Checking Integrated Circuit is the lockout chip.