Multimeter

[Takeshi Kaneshiro]

Cheap soldering iron didn't have any thermostat controling.

For the oxidisation problem, I got two soldering iron was dead in few weeks, one is 60W RM9.90 and 200W RM12.90. Those iron really not good, since it was very high watts, but it can't melt a solder in a short time like HAKKO in full heating process.

BTW, a good and powerful soldering iron can boil the solder in few sec... scary...

[kerry]

OH MY GOD!!  you make it like a pro level conversation...

No lah! where got one!

Do you mean the cheap soldering iron had a oxidisation

Not all, I have two identical set of those soder iron.
Like usual, cheap = lower quality control

that makes it dead suddenly

suddenly is not the right word, it's like a time-bomb, just I don't expect it so soon.

with no reason one??

I got unlucky, perhap th eoxidisation start on the first day of use. How can anybody notice the element inside the tip got karat? Again, maybe just bad karma....

[Takeshi Kaneshiro]

OH MY GOD!! you make it like a pro level conversation...

Do you mean the cheap soldering iron had a oxidisation that makes it dead suddenly with no reason one??

[kerry]

Err.... what is oxidisation??

Alamak!! karat ma! the heating element got karat then putus

Is that called IMO MOSFET? that kind of MOSFET is it don't need a driver can work it? Just not really understand what type is it..

IMO=In My Opinion (not a type of mosfet)

[Takeshi Kaneshiro]

Err.... what is oxidisation??

Is that called IMO MOSFET? that kind of MOSFET is it don't need a driver can work it? Just not really understand what type is it..

[kerry]

Not necessarily a hardcore only need a good solder iron or any other tools, infact in my case, I merely solder computer fan or sometime extracting few component from surplus board.

Forgot to tell that the cheap iron had oxidisation on the element, that's what make it fail. You (and myself) won't be experiencing this problem should it be a better type of iron in the first place.

BTW Takeshi, IMO MOSFET is easier to handle because I don't have to bother myself matching bipolar's hfe in circuit. The major problem I had with MOSFET is it to sensitive to ESD.

[Takeshi Kaneshiro]

Yes.... coz Bipolar transistor is easier than MOSFET, MOSFET is an advance semiconductor, so its hard to use.

Well, buying which soldering iron dependson which job you do. If you are a kind of hardcore on soldering, you may need a pro soldering iron that costs RM150+. I don't know what brand is it but I know it is a thousand features and super duper non stick tip.

[kerry]

Haiya friend, we come from 9rc so much I know about you. Well perhap your brother not an expert but much into audio because long time ago you're so much influenced to using power bipolar instead of power mosfet. It's so significant in your previous schematics.

I've a hakko but at my house I'm looking one to replace the broken iron at my office. Maybe I'll get a soldering station. Hmmmmmmm!!!!

[Takeshi Kaneshiro]

Well a digital meter has no choice....

Yes, I still remember the cheap soldering iron. Now I'm using Hakko Green soldering iron, it costs RM28 in here, Its nice and got a non stick tip on it and also a spare tip too.. this soldering iron does a good result for me.

Eh? how do you know me got a brother? He's knowledge more better than me ofcourse, but not expert in audio stuff, me and my brother are using the same equipment.

[kerry]

I don't think such thing is posible. Since (I presume you're using those cheap DMM) those meter are using ASIC for input and output.

The one I use currently only cost RM15.00 but sufficient for all R/C or audio need.

Remember the cheap solder gun that I recently aquired? Well, a fortnight ago it failed me .

Time to shop for a Hakko or Antex

Takeshi! if my "memory served me correctly" you have a brother that expert in audio. Why don't you borrow his equipment for a while. I'm sure your 'experiment' wouldn't require a hi-speed DMM all the time.

[Takeshi Kaneshiro]

i don't quite understand what you mean.

Changes? There are two of them. Screen refresh rate or input sampling rate.

Check out the spec of your meter. Sampling rate is fast but the problem is when measuring AC or variable source the display unable display the exact value. Its not the device or design fault but its just not practical but not impossible. If you see on the more expensive meter the is an analog bar for that particular purpose.

If you want to monitor minute changes, get an analog meter, better is to get CRT or if you have big pocket get one of the DSO.

I wish I cant afford that

Ya ya, the screen refresh rate(just forgot how do I explane that time). Is there anywhere do to make it faster? If theres only way to get an analog meter, I better stay at digital meter, coz was hard to checkout and the price was cost me a neuclear bomb..

[kerry]

i don't quite understand what you mean.

Changes? There are two of them. Screen refresh rate or input sampling rate.

Check out the spec of your meter. Sampling rate is fast but the problem is when measuring AC or variable source the display unable display the exact value. Its not the device or design fault but its just not practical but not impossible. If you see on the more expensive meter the is an analog bar for that particular purpose.

If you want to monitor minute changes, get an analog meter, better is to get CRT or if you have big pocket get one of the DSO.

I wish I cant afford that

[Takeshi Kaneshiro]

Does anyone know how to tune the digital multimeter monitor changing timing faster? Normal is 1 sec change 1 time, I want it change faster a bit..