Enhanced MFD beased on DDS

[Freelander]

Hi to all,

I'am working on the Carl's MFD project, and I need to improve this device with a DDS (Digital Direct Synthesis),

see diagram:


Thanks to share your experience on this subject.


Many thanks

[Freelander]

What's your opinion on this basic shematic?

[Freelander]

Let's make lock on this DDS kind found on Ebay:

[Geo]

At my MFD i use the TDA 2030 for more power.
The DDS that you show is OK.

[Freelander]

Thanks ***Geo*** for sharing info, here your answer on the schematic.


Thanks to check here the Vs and V input, from your experience, to get those 2 values simultaneity do you use serial batteries?




I'm waiting feedback friends

[Freelander]

Here the TDA2030 datasheet of parameters and standard schematic.

[Geo]

Originally Posted by Freelander

Thanks ***Geo*** for sharing info, here your answer on the schematic.


Thanks to check here the Vs and V input, from your experience, to get those 2 values simultaneity do you use serial batteries?




I'm waiting feedback friends

Be careful the V+ of DDS !!!!!
I think that at your schematic the Vin is the power supply.

[Freelander]

Thanks Geo for following,

Here the DDS input required is 5V, and for Tda2030 I think better use 18V, this requir 2 different power supply values.

I'm ready to modify what you purpose,

[Freelander]

Here the rectified schematic, what do you think **Geo**

(I'think that am not very lucky to start project in summer holidays season )

[Geo]

Originally Posted by Freelander

Here the rectified schematic, what do you think **Geo**

(I'think that am not very lucky to start project in summer holidays season )

I prefer to put a 7805 at 18V and connect the output to the DDS

[Freelander]

Here the update ***Geo***,

(only the changed part, to not charge the topic by unneeded data )


Many thanks my dear.

[Geo]

Originally Posted by Freelander

Here the update ***Geo***,

(only the changed part, to not charge the topic by unneeded data )


Many thanks my dear.

Connect 7805 to +18V, no to 9V.

[Freelander]

Many thanks ***Geo***

Ok, I will use 12V rechargeable battery 1300MA.H, it's can be good?

So what's the minimum voltage that can maintain stable the TDA2030, cause I need to adjust the Zener diode.

from datasheet this chip request +-6V =>12V.

[Geo]

Originally Posted by Freelander

Many thanks ***Geo***

Ok, I will use 12V rechargeable battery 1300MA.H, it's can be good?

So what's the minimum voltage that can maintain stable the TDA2030, cause I need to adjust the Zener diode.

from datasheet this chip request +-6V =>12V.

Zener, led and press switch are as battery indicator. So you don't need them.
General.... for the TDA2030 i prefer a voltage of 14...24V.
The choise is your.

[Freelander]

Hi friend,
Yes this is optional, but this device is very sensual, and at least it's preferable to have an indicator/idea of power.

With your council, witch "transformer with ferrite core" can I use?

[Geo]

Hi.
No ned for ferrite transformer.
A simple transformer with iron core is OK.
A 230v/ 12V-3A is ok.

[Freelander]

Here the final schematic, many thanks dear ***Geo***

The 220v pole will be connected to bras earth, Geo? if we accept the input/output yield.

[Geo]

Originally Posted by Freelander

Here the final schematic, many thanks dear ***Geo***

The 220v pole will be connected to bras earth, Geo? if we accept the input/output yield.

You don't need C4.....

[Geo]

Originally Posted by Freelander

Here the final schematic, many thanks dear ***Geo***

The 220v pole will be connected to bras earth, Geo? if we accept the input/output yield.

You must change the tranformer....
The 12V side must connected to TDA2030 and the 230V side to earth...

[Freelander]

Originally Posted by Geo

You must change the tranformer....
The 12V side must connected to TDA2030 and the 230V side to earth...

Yes friend, this is the input/output transformer yield, only I did not prefer to write 12v/220v to not mix with a converter.

Many thanks ***Geo***