♫♪ My little cheap Circlophone© ♫♪

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#2,301
Elvee said:
As Minek mentioned, R23 and R are the only resistors you need to modify to alter the gain/sensitivity.
To keep the simulation happy, you might find that other tweaks are required, but they could prove disastrous in the real world
Click to expand...
I am confused now sorry earlier you mentioned R12 and above you said R23 so do you mean the feedback series and R are the ones I could tweak,

So I shouldn’t touch the 22 Ohm Vas emitter resistor.
 
#2,303
Hello Circlophone friends, I recently met up with my
friend Stallion the other day and he asked why Q5 and Q6
have to be types 2N3019 or KSC3503 ?
He said it must also work with BD139 or maybe MJE340G?
My friend Stallion is more a developer of preamplifiers and digital technology.
 
#2,309
Allen Circlophone-Anhängern ein frohes neues Jahr.
hoffe ihr hattet alle einen guten Start ins neue Jahr.
Hier ist eine neue PCB-Version von mir und Stallion.
Hengst, mein Freund, wollte eine Version mit Sicherungen und im Format 100*100mm.
Er möchte jedoch nicht, dass diese Version im freien Open Source landet.
Bei Interesse schreiben Sie mich direkt an.
Danke OSGO
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#2,310
oscargolf said:
Allen Circlophone-Anhängern ein frohes neues Jahr.
hoffe ihr hattet alle einen guten Start ins neue Jahr.
Hier ist eine neue PCB-Version von mir und Stallion.
Hengst, mein Freund, wollte eine Version mit Sicherungen und im Format 100*100mm.
Er möchte jedoch nicht, dass diese Version im freien Open Source landet.
Bei Interesse schreiben Sie mich direkt an.
Danke OSGO
View attachment 1125233
Click to expand...
Hi Oscar,

A very Happy New Year, Congratulation on the new board.

Have you tried this board testedin practial. how does it perform.

what is the dc offset you get with this setup along with the Quiesent current?
 
#2,313
oscargolf said:
Hello Aditya,
Your board looks very good too. It's just that I'm not so good with SMD. But the board looks good.

Yes of course I have tested it and my DC-OFFSET is
< 2.5 mV.
Click to expand...
Thank you Oscar,
But I would know how it performs once I get it from the fabricator. Fingers crossed

Your offset is cool 👍

I would like to know if the position of VAS transistors would affect the response in anyways and where should they be placed
 
Last edited:
#2,318
Hello Vunce,
here are the data of the Canton capacitor !
Manufacturer Arcotronics (now Kemet).
**** expensive but good.

Canton capacitor:
GENERAL TECHNICAL DATA:
Dielectric: polyester film (polyethylene terephthalate).
Plates: aluminium layer deposited by evaporation under vacuum.
Winding: non-inductive type.
Leads: tinned wire.
Protection: plastic case, thermosetting resin filled. Box material is solvent resistant and flame retardant according to UL94.
Marking: Manufacturer’s logo (if requested), capacitance, tolerance, D.C. rated voltage.
Climatic category: 55/105/56 IEC 60068-1 Operating temperature range: -55 to +105°C Upper operating temperature of +125°C is allow ed for a max.operating time of 1000h.
Related documents: IEC 60384-2
Arcotronics:


R60ER4560ZC00J = 5µ6-100DC/63AC V – 5% - RM27.5mm
 
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