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
Posted in Collectible Stuff, Indonesia, Personal | Comments (9)

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.

(more…)

Tags: B+ supply, DIY-Audio, heater supply, power supply, regulator, transformer, tube
Posted in DIY Audio, Personal | Comments (4)