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Post pics of your builds.... - Page 631

post #9451 of 9638
Quote:
Originally Posted by vixr View Post
 

Very nice... I'm a fan of unique case work, very nice...12 volts on the heaters seems a bit high.


12.6v is the normal value for ecc82 (heaters wired in serie).

 

@Roberval: very nice build btw, very clean looking. I would have wired the output opamp in non-inverting configuration to avoid using such high feedback resistors (it increases noise a bit) but it is only a minor concern.

post #9452 of 9638

Thanks everyone and 00940 thank for the tip. I am not and advanced electonic guy - normally I put the pieces together and pray for them to work well he, he, he....

post #9453 of 9638

I really need to get a digital camera...

 

Anyway, here's a 2K, 36 steps volume control. It's made of a 12 positions shorting switch, for -2 to -24db attenuation in 2db increments (+/- 0.1db, since I used "common" resistor values), and of a 3 positions switch, with pads for -0db, -15db, -30db. Thus three overlapping ranges, depending on needs.

 

It is for the output of dac. 2k is high enough to be driven by the dac output stage and low enough to drive the input stages of my amps. The -2db first step, rather than 0, provides protection for the output stage (it always sees a 430 resistor even if the output is shorted).

 

It is a reasonably cheap built. The big switch is 5€, the lorlin 2€, the 34 resistors about 3€ so 10€ total (+ shipping of course).

 

post #9454 of 9638

I recently completed a pair of Decware zkit1 amplifiers for my father-in-law.  He calls it SteamBilly.  It's not 100% done, but DIY projects like this rarely are.  I realize it's different from what a lot of folks on here are into, but here it is.

 

 

 

 

 

Tube glow

 

post #9455 of 9638

1st build, a DIY rechargeable CMOY,

 

2nd build had a bit more class, an RA-1 clone in a cigar box,


Latest build, the Bottlehead S.E.X.

post #9456 of 9638
Quote:
Originally Posted by PScal View Post
 

I recently completed a pair of Decware zkit1 amplifiers for my father-in-law.  He calls it SteamBilly.  It's not 100% done, but DIY projects like this rarely are.  I realize it's different from what a lot of folks on here are into, but here it is.

 

 

 

OUTSTANDING !!!!

post #9457 of 9638
Quote:
Originally Posted by PScal View Post
 

I recently completed a pair of Decware zkit1 amplifiers for my father-in-law.  He calls it SteamBilly.  It's not 100% done, but DIY projects like this rarely are.  I realize it's different from what a lot of folks on here are into, but here it is.

 

 

 

 

 

Tube glow

 

That (excuse my teenage lingo) looks sick.  How does it sound?

post #9458 of 9638
Quote:
Originally Posted by Zashoomin View Post
 

That (excuse my teenage lingo) looks sick.  How does it sound?


Thank you.  It sounds fantastic.  Next week it's going to live at his place, so in the meantime I'm trying to get as much enjoyment out of it as I can.

post #9459 of 9638
My Prototype of Project Palaios, PP-P?, finally has a case. XD




Inside (Click to show)






^ I hate multi-stranded wire...the things broke twice on me >.>

The potentiometer turns really easily, but luckily the 6.3 mm hole I drilled in the case has a snug fit and it's harder to turn now.
Edited by miceblue - 12/2/13 at 12:26am
post #9460 of 9638

Multi-stranded wire should hold up if you tin it first i.e. twist it and apply some solder to the end. That's at least what I've found.

post #9461 of 9638

Let's continue with accessory builds. Here's a small transformers box. The aim is to provide impedance matching in between high-gain, low-current amps and low impedance headphones (anyone remembers the Audiovalve "Impedanzer" ?). It uses 100v line transformers from monacor. Two positions: 5:1 and 10:1 (voltage ratio).

 

Most probably very low inductance so best driven from a low impedance output. It is intended to complement my current headphones amp. It sounds "right" using the hd650 on the 5:1 tap but I'll have to measure the FR one of these days.

 

post #9462 of 9638

Well, here is the third set of boards for this amp I've etched with the latest changes...still waiting on my transformers from Edcor. I hope they get here soon before I run out of copper clad.

 

 

post #9463 of 9638

I got some wiring done this evening, I am trying to keep the power trans as far from the OP trans as possible. I bought a 12x12x4 enclosure, so with some luck there should be plenty of space between the transformers. I intend to put the power switch in the back and a 1/8 mini in front to keep the wiring simple and keep the input away from the A/C stuff...

 

This little toggle switch on the left will let me switch between the 300 and 600 Ohm taps on the output transformers.

 


Edited by vixr - 12/8/13 at 8:47pm
post #9464 of 9638

My first EVER project requiring a soldiering iron: a very ugly mono LM386 pocket amp. Im proud, but also humbled by some of the stuff you other guys make.


Edited by Atomicus88 - 12/10/13 at 11:57am
post #9465 of 9638
Quote:
Originally Posted by Atomicus88 View Post

My first EVER project requiring a soldiering iron: a very ugly mono LM386 pocket amp. Im proud, but also humbled by some of the stuff you other guys make.


Watch all three parts of this tutorial and you will be able to solder anything.

http://www.youtube.com/watch?v=J5Sb21qbpEQ&sns=em
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