IF YOU HAVE MAKE , TRY THIS .

[sisco]

Hi ,

my PCB is ready .I test power unit .it work very good without problem

, only must stay for OPA37.

see this picture , what is better ? connect pin2 CNY17 to ground or -12 ?

[1843]

Hi ,

my PCB is ready .I test power unit .it work very good without problem

, only must stay for OPA37.

see this picture , what is better ? connect pin2 CNY17 to ground or -12 ?

It must be grounded.

[sisco]

Hi 1843 , about resistor (before opto diode) how ?

for resistor must use what value ? in other circuit like minipuls we don't have

limited for current because for -5 use convertor but in this circuit for +5 use

converter voltage and have limited for current and can't use 220 ohm .

i want know opto diode in optocoupler need what current for drive?

[1843]

Use 2.2K resistor.

[sisco]

Use 2.2K resistor.

I use 2.2 K and hope work.

for DISC I think and speak with other friends in microcontroller forums about

A/D .best suggest was use micro for A/D bucause using A/D IC is very hard.

so I use two Atmega8 for A/D (for two channel) and one Atmega32 for

timing and drive graphical LCD (128*64).

but I have a little mistak in my schematic (because i don't thinked

about voltage level between microcontroller and sampler 4051) and try to do this .

this matal detector can work without LCD with normal DISC .

but for best DISC must use this MODULE .

as yet I stay for OPA37

[sisco]

and finally my new project near to complete.

now I busy for write microcontrollers programme.

if work i send to any friends want.

[1843]

and finally my new project near to complete.

now I busy for write microcontrollers programme.

if work i send to any friends want.

What a large PCB!
PD3200 uses an ATmega8 for all the DISCs, battery charger, LCD, GB, keyboard, sound, battery and temperature indicator, etc.
Even it doesn't have a crystall! Its ATmega8 is run by internal RC circuit at 8MHz.

[Max]

What a large PCB!
PD3200 uses an ATmega8 for all the DISCs, battery charger, LCD, GB, keyboard, sound, battery and temperature indicator, etc.
Even it doesn't have a crystall! Its ATmega8 is run by internal RC circuit at 8MHz.

Hi,
I think Sisco's work is nice... even if board is a bit large.

Ok, maybe require a bit of optimization and some parts like MCU can do many tasks at same time... but for now lets concentrate on results... then he'll focus on optimization.

We have to see which results on e.g. disc then we'll talk about redundancy reduction.

Kind regards,
Max

[Qiaozhi]

and finally my new project near to complete.

now I busy for write microcontrollers programme.

if work i send to any friends want.

Hi Sisco,

Good work!
I would be very happy if you were to share the schematic.

[sisco]

What a large PCB!
PD3200 uses an ATmega8 for all the DISCs, battery charger, LCD, GB, keyboard, sound, battery and temperature indicator, etc.
Even it doesn't have a crystall! Its ATmega8 is run by internal RC circuit at 8MHz.

can send me PD3200 original HEX file ?

see in large PCB i use one ATmega8 .

small PCB for drive graphic LCD (128*64) with high resolation and
Precision A/D.

i make all my PCB not only for work in one method . may be after few days or months i find better way , must can connect to this PCB so use many connector in my PCB.

[sisco]

Hi Sisco,

Good work!
I would be very happy if you were to share the schematic.

i have a problem in my schematic . see picture , must use one level voltage between atmega8 and 4051 so use CNY17 but CNY17 out pulse is with delay and not clear , i busy for this.

can somebody help me , i need negative voltage converter like GS4 power.
GS4 converter voltage is good but this is positive and i need negative.

[Qiaozhi]

i have a problem in my schematic . see picture , must use one level voltage between atmega8 and 4051 so use CNY17 but CNY17 out pulse is with delay and not clear , i busy for this.

can somebody help me , i need negative voltage converter like GS4 power.
GS4 converter voltage is good but this is positive and i need negative.

What is the pulse width and pulse period?

[sisco]

What is the pulse width and pulse period?

pulse width is around 26us and pulse period is near 1ms.

[Max]

i have a problem in my schematic . see picture , must use one level voltage between atmega8 and 4051 so use CNY17 but CNY17 out pulse is with delay and not clear , i busy for this.

can somebody help me , i need negative voltage converter like GS4 power.
GS4 converter voltage is good but this is positive and i need negative.

Hi,
you can use a 7660, if current required is low, for that or modify the GS4 one reversing diodes etc not difficault

Best regards,
Max

[sisco]

I think 7660 can't supply 11-12 IC current.

aboyt GS4 power , I test , this work very good.I need one power supply like this for negative voltage.