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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

The Kuartlotron - keantoken's simple error-correction superbuffer
The Kuartlotron - keantoken's simple error-correction superbuffer
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Old 27th July 2015, 07:39 PM   #291
jls001 is offline jls001  India
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Thanks Destroyer, AndrewT and keantoken.

I bought the parts and assembled it point to point. Actual soldering is pending. I have some more questions:

1) couldn't get 56 ohms trimmer. Will 50 or 100 work in its place?
2) couldn't get 3.6k trimmer either. Got 5k. Hope it works?
3) ditto 2.7 M trimmer. Will a 1.5M fixed in series with 1M trimmer do?
4) do the legs of the trimmer work like a regular pot? My understanding is 1 is input, 2 wiper and 3 ground. Is this correct?
5) I'm not clear what to measure when adjusting trimmers R1 and R9.

Thanks for being patient with my noob questions.
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Old 27th July 2015, 09:19 PM   #292
AndrewT is offline AndrewT  Scotland
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the wiring of the trimmers depends on what you need them to do.
If you want/need a voltage reducer then you wire as a three terminal potentiometer.
Although actually it is a 4 terminal device where pin3 is common to both the input and to the output, i.e. in = 1-3 and out = 2-3

If you need a variable resistor then you wire it as a two terminal device, where the wiper gets shorted to either 1, or 3, depending on whether you need ClockWise (CW) to increase, or decrease, the VR value.

pots/trimmers come in few values E3 mostly, 1, 2, 4.7or5, 10
Choose the e3 value above the maximum you would ever need.
For the 2M7 VR, I would use 1M pot + 2M2 fixed, to give range of 2M2 to 3M2
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Old 27th July 2015, 10:37 PM   #293
keantoken is offline keantoken  United States
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1: Use 50 ohms.
2: Should be fine, if not optimal.
3: The 0 DC offset point may be outside of the range of the trimmer. I would use 2.2M with the 1M trimmer so that you have plenty room before and after 2.7M (which is just a guess for what the optimal value is)
4: Maybe. For long trimmers sometimes the last pin is the wiper. In this circuit the wipers are always shorted to one of the pins. Whether you short the wiper to one pin or the other determines which direction the screwdriver will turn, but won't matter for the circuit.
5: This is DC offset. Measure DCV from output to ground with nothing connected to the input. Adjust R9 so that it's as close to 0 as you can get.
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Old 31st July 2015, 07:46 AM   #294
jls001 is offline jls001  India
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I completed PTP wiring on a general purpose board. Quite tedious and the underside of the board can soon get rather complex.

Will crosscheck wiring once more before powering it up.
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Old 3rd August 2015, 08:14 PM   #295
jls001 is offline jls001  India
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Finally completed the build. I made so many mistakes I lost count

Luckily for me fellow forumer baswamin who had successfully completed this build, patiently helped me to troubleshoot as I bungled from one folly to another, and with my persistence not to give up on my first point to point build, it has paid off. Hats off to you, baswamin

And it's sounding pretty damned good. I am on my seventh track (Sibelius' Symphonic Poem Finlandia), and I think it's already shamed the DCB1 clone I built. Very clean, very transparent, deep tight bass, clear separation and quite dehomogenised. I like it.

Some details:
DC offset is about 2.9 to 3 mV on both channels. Pot is 10k log (CITEC, UK). My source has impedance of 100 ohms, and the power amp has input impedance of 100k. I'm not sure if 10k is the optimal value. I'm just using what I have on hand. I can try a 50k log, if that will be a better match. All parts are strictly common garden variety bought from the local electronics market, absolutely no exotics used.

It's been a steep learning curve but well worth the sonics. Thanks keantoken for sharing this wonderful design.
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Old 3rd August 2015, 10:58 PM   #296
brianco is offline brianco  Ireland
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Are boards available for this project?

Many thanks.
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Old 4th August 2015, 07:16 AM   #297
AndrewT is offline AndrewT  Scotland
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10k fed from 100r and feeding 100k is good with many lengths of cable found in a domestic environment.

Using 50k vol pot will only work well with a very short/low capacitance connection the the next stage.
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Old 9th August 2015, 06:42 PM   #298
jls001 is offline jls001  India
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Completed housing it a cabinet:

Click the image to open in full size.

PS section:

Click the image to open in full size.

It's making good, highly agreeable noise
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Old 9th August 2015, 08:47 PM   #299
Destroyer OS is offline Destroyer OS  United States
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The Kuartlotron - keantoken's simple error-correction superbuffer
Nice, you should give the volume control an upgrade to really show it off!
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Old 9th August 2015, 09:47 PM   #300
TNT is offline TNT  Sweden
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Quote:
Originally Posted by brianco View Post
Are boards available for this project?

Many thanks.
Dirt Cheap Dirty Boards

//
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