Posted on Wednesday, 14th April 2010 by Auw Jimmy

Finally, I change my main transformer orientation, from horizontal to vertical. Not really easy to mount this giant transformer vertically. But here is the result. I’m quite sure I love this new orientation than before

Actually, the best solution is if you can “sealed” the two side of the transformer by a metal plate (either aluminum or copper). But since my DIY chassis is completely “rubbish”, then I don’t think I can do that. Just prepare for a future plan, so I keep the vertical mount position now.

This Z11 based iron with Australia/Germany copper wire is rated around 150VA or more. With current load about 110VA from my preamp, this giant is completely cool for over 8 hours non-stop performance. Damned, I do love this transformer! Sadly, not easy to get similar transformer in the near future (Z11 is quite rare here and expensive).

Tags: transformer
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Posted on Sunday, 4th April 2010 by Auw Jimmy

Before, my main transformer was designed to be mounted in vertical position. As you can see, the L-Shape was designed to be bolted on the main chassis vertically.

Due to some reason, after few hours experimenting, I didn’t really like this vertical position. Why? I haven’t found enough evidence, but for now, I must change the mounting position, from vertical to horizontal.

After few hours on the local electronic parts shop, I managed to find some tools for this purpose. And another few hours to install this and here is the result. Tadaaa… My transformer is ready to be mounted horizontally.

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Posted on Thursday, 3rd December 2009 by Auw Jimmy

I order another transformer. This should be an upgrade of the previous version.

First, I add 0-75V tap for my neon lamp INS-1.

Second, I upgrade from H10 to Z11 lamination, from 35 size to a bigger 38 size.

Finally, I also upgrade the internal wire from local made to Germany/Australia combination.

It’s a kind of oversize for an “only” 100+VA transformer.

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Posted on Saturday, 28th November 2009 by Auw Jimmy

Finally, with the help from my girlfriend, I manage to get the Nuvotem Talema Transformer on hand within a week. It’s rated at 6.3A with 2x18V output or about 225VA. Not bad for my LM1875 huh…

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Tags: power supply, talema, transformer
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Posted on Sunday, 22nd November 2009 by Auw Jimmy

I ordered custom made transformer to replace my old Aikido Pre-Amp transformer. Before, I rarely ordered a “finished” transformer (but prefer doing DIY one with my colleague). But now I’m thinking to try a “proven good” transformer (and considering doing some comparison of its effect).

Finally it’s done. The transformer consisted of few secondaries, to supply my main high voltage, the rectifier, and the tubes.

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Tags: Aikido, preamp, transformer
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Posted on Sunday, 6th July 2008 by Auw Jimmy

My custom power transformers have just arrived. Like on my previous post, I plan to use 4 power transformer for my next Aikido project (two Heaters and two High Voltage). So here is the stuff

The first line above is the High Voltage power transformer (primary on 220V, secondary on 200V, 220V, 230V, 250V, 5V , and 7.5V). I have extra heater’s secondary in case I don’t want to use the additional transformer. The High Voltage itself rated at 200mA, while the 5V/7.5V rated at 3A.

The second line above is the Heater power transformer (primary on 220V, secondary at 5 and 7.5V). Rated at 3A. So, I completely separate the Heater and High Voltage power transformer, resulted in 4 power transformer for this project. (more…)

Tags: B+ supply, DIY-Audio, heater supply, transformer
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Posted on Sunday, 29th June 2008 by Auw Jimmy

Due to parts shortage on some components, I can’t complete the assembly of my DIY project. So I just write down the idea on my scratch book. Here is the plan.

For the filament/heater supply, I plan to use LT1083 regulator. It is a good regulator for audio compared with the LM (78xx) or LM 3xx series. The first capacitor should be NOS Elna Silmic 2200uF (should be 4 or 5 in parallel). Then, a 1 Ohm/10W resistor should be place in series. Then another parallel filter with BlackGate F Series 680uF. At the end, LT1083 will do the final regulation to provide exact 6-6.3 VDC (depends on my divider resistor).

I use dual mono design for filament and also dual mono for high tension (B+). For each channel, I need around 1.6 Ampere filament power. I use custom power transformer rated at 7.5 VAC and 3 Ampere.

For high tension B+ voltage. I will have two versions.

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Tags: B+ supply, DIY-Audio, heater supply, power supply, regulator, transformer, tube
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