Archive for May 12, 2014

Sony TA-F270 Inside

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Hello,

I had a Sony TA-F270 over for repairs and i thought i should how you how it looks inside.

Service manual is available online if you search on Google.

Sony TA-F270 inside

Sony TA-F270 inside

Sony TA-F270 inside

Sony TA-F270 inside

Sony TA-F270 inside

A pair of power transistors were busted so i replaced them.

Sony TA-F270 inside

Here is a short video on how to do it.

Thank you for visiting

Microphone Preamplifier Part 2

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Hello Project Ryu fans,

About a month ago i reversed engineered a mic preamp module from an old console. If you don’t remember please refer to the article here. After i rebuilt the modules with newer components i decided to build a nice 2 channel preamp with them.

Below you can see the circuit for the unit. M1 and M2 are the modules presented in part 1.

Dual Channel Mic Preamp

As you can see it splits a 12V rail into +/-5V duble rails. I did this because i wanted to make it more mobile so i can power it from a big battery.

Below you can see my example of chassis.

 

Dual Channel Mic Preamp

Dual Channel Mic Preamp

Dual Channel Mic Preamp

Dual Channel Mic Preamp

This preamp doesn’t have a phantom power although you could easily add a +12V phantom power. In this regard it is best suited for dynamic microphones.

Thank you for visiting.