My Twinkle

[fwh1599 0]

My Twinkle(OP+DB):

 

Case Test No.1

It used MUSE BP 10uF/25V as coupling and feedback

 

Case Test No.2

It used WIMA 1uF/50V as coupling and feedback(R8=10K,R7=68K)

 

Case Test No.3(PCB Ver.Test 2)

It used WIMA MKS-3 1uF/63V as feedback,and DC coupling(R8=10K,R7=68K)

Edited May 6, 2004 by fwh1599

[jtfoo 0]

Very nice.. What are those yellow ting that you put around the transistors?

 

BTW, nice PCB and layout..

[fwh1599 0]

Very nice.. What are those yellow ting that you put around the transistors?

 

BTW, nice PCB and layout..

It's rubber cannulation(heat shrinkd),around Q1-Q2,for holding same temperature.

[jasonhanjk 0]

It helps to prevent either one of the trans to go into thermal problem by sharing both trans temperature.

 

Nice PCB work you got there....

[jtfoo 0]

Jason,

When can you start your PCB lesson? Though I may not venture into it, won't hurt to know something more.

 

So the yellow thingy is the same thing when I asked you why you tie rubberband around the transistors. So temp of both transistor are uniform..

Edited May 8, 2004 by jtfoo

[fwh1599 0]

I will accomplish Case Test No.4(PCB Ver.Test 3) in next week.

 

It include 4 betterment:

 

1.DC coupling(It is most important improve for sound of Twinkle);

2.Strengthen supply after regulator;

3.Increase protect circuit without realy(Sensitive and not hurt timbre);

4.Increase user-friend iindicatory circuit(Light at natural,flash at problem)

 

I wish it is finally PCB for Twinkle,It have high quality sound and security.

Edited May 7, 2004 by fwh1599