i want to know the dimension of the PCB in order to make one
plase type it in  mm
thanks

1 inch equals exactly 24.5mm. Figure the numbers in mm accordingly, lazy guy!

Hello everybody,

I am in close contact wiht a Korean producer of UV-LEDs. Since those people know how to produce the LEDs they don't know much about marketing.

I sent them already a list of more than 1.000 German electronic suppliers and I am curious to know if there exists something similar to Germany, a CD with all German  telephone numbers and the associated addresses.

If it exist in England please let me know the name and the distributor of it.

The German equivalent is called D-info.

Many thanks

HtG

Hello everybody,

I read an article in Philips application note (AN170, Dec. 1988) about an application to convert voltage to pulse duration - PWM.

I tried the circuit with a simulator programme with the only difference using 2N2222 instead of a 2N3642. No matter which input voltage is applied or offset adjustments are done the timer output is constantly high.

The simulation programme is very old and maybe some features of the NE555 are not implied.

Has somebody made any experience concerning voltage to pulse duration? If Yes please notify me.

Thank you

Herman the German

Thanks a lot! I'll find a place to buy them.

 

Nixie tubes were a long time used before LED displays. Who knows a loacation where nixie tubes are still available?

Kind regard to all

Herman the German

Mils don't help not knowing how many! Setting mils instead of inches just changes the value. I have got that far, 100 mils equal 1inch. Good to know somebody likes my desktop. My wife doesn't!

 

Thank you very much. I will try.

hybrid is also used to grow animals and plants. If you buy a hybrid chicken this chicken will not be able to produce chicken. If you buy a hybrid tree it will not produce further trees.

That means you have to buy over and over for good profit of the breeder.

HtG

 

I have downloaded a programme calculating for voltage loss in any conductor. It seems helpful using it to design PCBs and the traces. However I do not quite understand which numbers I need to put in fora standard PCB with a copper layer of 35 micrometers.

Is there somebody who can put the correct values in the boxes to design PCBs with traces no smaller than required and no bigger than necessary (to have space for signal traces)?

To make it more delightful I added an attachment with a beautiful girl (her name is Vida Guerra (top model))

regards

Herman the German

 
Checking at semiconductor companies such as Motorola, Texas Instruments, Siemens, SGS-Thomsen (ST) does not show that they are producing laser equipment.

Who knows where to get such devices?

Thank you for your help. I checked it and just found a timer. This is not what is on my mind. The timer should have the following properties: Count up and down 999.99 seconds and use optoelectronics to start (car races for instance), switch off the microwave oven after the exact preset time and work as a photimer as well to expose PCBs.

I just have difficulties with the pins clock in, clock out, borrow and carry since they are not described thoroughly enough in the data sheet.

Regards

HtG

To whom it may concern,

I have studied this power supply a bit and found some discrepancies. I can not go along saying that an electronlytic of 3300UF is sufficient for an AC-ripple of 0.01%. 0.1% comes closer according to my experience.

I also have made some changes, e.g. the driver for the power transistor.

Look it up let's discuss.

HtG

I have downloaded Digital Works lately but I can't get through to download a registered version of the programme. Using the URL I usually get redirected to another and there is nothing to find concerning "Digital Works". Using the email address the email is returned for unknown address.

Who knows more about it? And if pleas give me a note.

Thanks

HtG

 

I'll try a completely new way concerning the power stages. 2N3055 is something I have seen in the museum. Two main changes will apply to a power supply with high perfomance. First the transformer will be a ring type (excuse me, my English is not better but may be understood). You can drive a ring type transformer almost to saturation and it will still work. Secon change: through out the dinosaur transistors and replace with N-channel Power MOSFET with no higher restance than 0.04 Ohms, even having the luxory that each individial transistor has a FLAG output to indicate that it is tired of working and give the whole burden to his brother.

Just let me think two or three nights about the theme. I'll come out soon with a good and affordable power supply.

Kind regards to all being busy with the problem.

HtG