my 1st DIY headamp, DONE!

[aaa 0]

top view

[heady 0]

Super. Good job. Have you found out how long does the battery last?

 

[aaa 0]

The quiescent current is about 35mA, anyway this number can easily calculated by adding the Iq of opamp + Buf + biasing current, and was calculated as I was designing the amp.

the active current is negligible, at least on the HD650.

Zinc carbon last like 5-7 hours.

for NiMH the capacity is well stated so you can calculate your self.

with Alkaline it should last more than 10hrs, though I have't try it 1st hand.

 

The puncher totally don't work

In fact it screw up the 1st hole that I was trying.

I guess there's great variation in the quality of these cheap puncher.

in the end I go back to hammer + pen-knift (a slim solid aluminum one).

the outline is far from beautify, but it works.

The uneven edge in pointed to the inside anyway.

Edited December 26, 2004 by aaa

[tropicalrips 0]

nice & tight should be able to fit it into a mid-size aluminium Hammond

[aaa 0]

aluminium Hammond is out of question bcos:

 

1. it's too ex here.

2. I don't have anything to drill hole through it, and tools are expensive.

[aaa 0]

Forget to mention,

I must thank Bram and Heady for helping me to get parts from farnell, or else my amp will never be finished.

[heady 0]

aaa. sounds like you did electronics in school? I am sorry, I know nothing about this and have returned most of my physics to teacher about 30 years ago. Thanks for your answer though. My two 9volt batteries (series) don't last very long in my Pimeta, maybe 3-4 hours.

 

Sorry to hear about the puncher, I guess I was lucky.

Edited December 27, 2004 by heady

[Firefox 0]

You should try using a hole puncher for belts instead. It won't risk bending the tin and can punch holes of various sizes.

[aaa 0]

electronics in school?

Not really, A level Physics teached next to nothing about electronic.

I just read a lot of datasheet.

 

I have thought of it.

I believe the base of the tin will be blocking the big radius wheel of that type of puncher.

[heady 0]

Firefox, hole puncher for belt is meant for a thick soft material which is cut by the circular blade against an anvil. It won't work with a thin metal.

 

[mirage 0]

If i want to make an amp like that, where do i start? must i know how to solder?

[sigma 0]

If i want to make an amp like that, where do i start? must i know how to solder?

You should learn, otherwise the components won't stay on the board

 

j/k

 

Reading would also be a good way to start.

[mirage 0]

i just knew i was asking for that..... will the diy amp in the other thread fit into an altoid tin? maybe you can sell me this when you get tired of it aaa

[aaa 0]

mirage,

 

I have calculated that if I will to buy another complete set of parts for such an amp, the total cost is about S$#125.

Since this is make by point to point soldering and not from a printed circuit board, it take quite some time and efford to make one.

So if you are willing to pay at least $200, PM me.

[fwh1599 0]

不错哦，第一次秒那么漂亮！