I bought an Olive 180 for the case (which I'll linish to proper CB look), output devices and transformer. Of course I then realised that the transformer is a lower voltage. 
I tried the guy in Cambridge who can wrap his transformers in flat black tape, but he was somewhat unresponsive.
So I'm still noodling over what to do next...
I tried the guy in Cambridge who can wrap his transformers in flat black tape, but he was somewhat unresponsive.
So I'm still noodling over what to do next...
In which century do we have symmetrical electricity? Like positrons as well as electrons. Like positive cathode tubes? Some things don’t change. Which is a source of insight if you think hard enough about it.
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No. If this is the original http://www.acoustica.org.uk/t/naim/poweramp_pix/nap reg schema.pdf
Then I am wrong.
I should have checked. I thought there was a mistake because zeners are noisy and it is common to shunt them with a large capacitance.
The BOM is correct.
If I were to design it myself I would indeed put in a bigger shunt (and even more importantly I'd put in a CCS for the zener). But I was trying to stay as true to JV's as possible.
(FWIW, here's my "clean sheet" regulator for another project, although it only handles the front-end:
If I were to design it myself I would indeed put in a bigger shunt (and even more importantly I'd put in a CCS for the zener). But I was trying to stay as true to JV's as possible.
(FWIW, here's my "clean sheet" regulator for another project, although it only handles the front-end:
Attachments
power going to reg boards
what is the ideal DC voltage that should be fed into the Nap250 reg boards? I looked on the interwebs and could not find an answer. Also i'm thinking 500VA is appropriate, is that unreasonable?
what is the ideal DC voltage that should be fed into the Nap250 reg boards? I looked on the interwebs and could not find an answer. Also i'm thinking 500VA is appropriate, is that unreasonable?
Nothing wrong with 500VA. I believe Naim used 400VA and 450VA.
Somewhere around 56V DC would be good, although it's not critical.
Somewhere around 56V DC would be good, although it's not critical.
NAIM regulator voltage drop
If the input to the regulator is +-56V DC what is the minimum and maximum output of the regulator that can be achieved with the trimmer?
In other words, what is the min and max voltage drop of the NAIM regulator output?
If the input to the regulator is +-56V DC what is the minimum and maximum output of the regulator that can be achieved with the trimmer?
In other words, what is the min and max voltage drop of the NAIM regulator output?
NAIM regulator
Hi, I build a nap250 clone. I'm using with simple rectifier. Result is very good.
what is the benefit of NAIM regulator?
Hi, I build a nap250 clone. I'm using with simple rectifier. Result is very good.
what is the benefit of NAIM regulator?
nap250 without regulator
I think what you have is a Nap200 clone, without regulator.
what are the benefits? build a set and report your impressions. i would be interested in your conclusions.
i noticed a nice bass control from the rig i built. i attribute that to the regulation. also the effortlessness i attributed to regulation. it would be interesting to hear your impression if you notice any differences.
I think what you have is a Nap200 clone, without regulator.
what are the benefits? build a set and report your impressions. i would be interested in your conclusions.
i noticed a nice bass control from the rig i built. i attribute that to the regulation. also the effortlessness i attributed to regulation. it would be interesting to hear your impression if you notice any differences.
I build. There is nothing wrong with sound. I couldn't compare with regulated amplifier, I don't want to build regulator up to now.
Yep, silver mica would be fine.
(On the other hand, it's kind of like an 80's girl without big hair, isn't it? 😀 )
(On the other hand, it's kind of like an 80's girl without big hair, isn't it? 😀 )
Hi Jeff I came back I fix some bug from me on post #153 and this is how the layout look like now 🙂
question this can work without the regulator? I see J1 and J2 and about current consumption in standby is low I got on simulation about 42mA from a 14.4mV
TP1 and TP2 that is about normal? I change P1 to 2.2K because it was drawing too much current if P1 use original value of 1K let me know when you get time
Regards
Juan
question this can work without the regulator? I see J1 and J2 and about current consumption in standby is low I got on simulation about 42mA from a 14.4mV
TP1 and TP2 that is about normal? I change P1 to 2.2K because it was drawing too much current if P1 use original value of 1K let me know when you get time
Regards
Juan
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Hi Juan,
Yes, you can regulate whatever you want. Naim regulated both the front-end and output stage on the 250, and neither on the 140. Most HackerNAP folks regulate just the front-end.
The jumpers are there to support various configurations (including single regulator for both but bi-wiring from the regulator to the amp board).
Odd that you had to change P1. Was it drawing too much current in the sim, or in real life? (If the former, I'd guess it's just some bad models in the sim.)
Yes, you can regulate whatever you want. Naim regulated both the front-end and output stage on the 250, and neither on the 140. Most HackerNAP folks regulate just the front-end.
The jumpers are there to support various configurations (including single regulator for both but bi-wiring from the regulator to the amp board).
Odd that you had to change P1. Was it drawing too much current in the sim, or in real life? (If the former, I'd guess it's just some bad models in the sim.)
P1 with actual original value 1K got it thanks and regulation info, I spend some time redrawing your layout I mean transferring to Sprint Layout 6 I love this style of kind like vintage look so nice here is the images side by side "not done yet" 😉
oh yes on simulation was drawing too much current got to be the simulation error yes I agree thanks Jeff
regards
Juan
oh yes on simulation was drawing too much current got to be the simulation error yes I agree thanks Jeff
regards
Juan
