Best copy of this?

[Esteban]

Hi
Found in Polish site, called ALL PI:

http://inio-01.w.interia.pl/

[amtech2005]

Best copy of this?

Since this is already posted on a public web-site , Heres a much clearer 3 sections. Dont forget about transistor errors "Backwards" , and a couple other Author Boo-Boos. Eugene [email protected]

[Esteban]

Thanks

Do you build it?

[amtech2005]

Best copy of this?

Hi Esteban , No I did not build this one . But it has been built by a few people , after the schematic was corrected . And from what I read and remember it worked Ok. I am experimenting with other PI circuits right now on a breadboard and everything is easy for me , except the making of the PCB boards , then I have trouble . Good luck to you on this one. Eugene

[Chris2]

This is the DBP2010

Hi Esteban,

This is not "ALL PI" this is the DBP2010 from the Elektor book. Here is what I found out thru compares.

The DBP2010 seems to be just a copy of the Sniffer XR7 only! I compared images from the PCB’s (Sniffer XR7 & DBP2010) that I found in the Internet.
This is similar to the Delta Pulse which is a copy of the Sniffer XR71 with a few modifications by adding some resistors.

The Sniffer XR7 is an older model of the Sniffer XR71.

I did the "pain" and compared the schematics of the Sniffer XR71, Delta Pulse and DBP2010. I can see that they are almost
the same schematics. Many component values are exact the same and they have the same circuit features and connections.
But the schematic drawing looks complete different.

What a coincident! Happy copying....

Chris

[Qiaozhi]

Since this is already posted on a public web-site , Heres a much clearer 3 sections. Dont forget about transistor errors "Backwards" , and a couple other Author Boo-Boos. Eugene [email protected]

I've reassembled the parts into one jpg file ->

[bbsailor]

Qiaozhi

Other errors.

Where is the damping resistor? Maybe it is mounted in the coil but should be on the schematic?

bbsailor

[Geo]

Hi Chris2. I can't tell about XR7 because i never saw the schematic of this. But Between DBP 2010 and XR71 or Delta Pulse there is big difference. They have not the same oscillator, not same power output (one has bipolar the other have mosfet), not the same sample, not the same amplifiers...... nothing common. DP and XR71 are the same but DBP2010 ....????????
Esteban is a missing version of DBP2010 ....the version with problems that don't work. You KNOW very well .
Regards

[amtech2005]

Best copy of this?

Here Geo and All , a few more parts to folder. Eugene [email protected]

[Chris2]

Hi Geo,

Delta Pulse and XR71 is exactly the same circuit. They might run on slightly different frequencies but the schematic is the same. If you do not believe it take the time and trace all connections back. You will be surprised of the out come.

There are minor not relevant differences between Delta Pulse & Sniffer XR71. One is an additional Auto/Manual switch with a potentiometer and a few resistors. These additional resistors are not relevant for the circuit to have it.

I don’t have the schematic of a Sniffer XR7 to compare it with the DBP2010 direct. But I have an image of the PCB of the Sniffer XR7. If some one is not “blind” he/she see that the DBP2010 PCB & component placement is a duplicate.

I’ll place later the images for you to see….

The Sniffer XR7 is a previous model of the Sniffer XR71. The main difference is the timing circuit, but with the same functions. The rest of the circuit is almost the same. I myself was surprised, I haven’t expected that either.


Regards

Chris

[Max]

I agree

Hi Chris2 and all,
I'm taking a look at the three schematics and agree that there are some minor differences between XR-71 and Delta Pulse (mainly frequency, timings , battery checker and the "auto" section present in the XR-71 only). The DBP-2010 seems similar to these previous but with different timings, different sampling tech, different switching device etc.
Major differences are so on timings: delta and xr-71 use the well known 4538's monostables (also found in many other 80' and first 90' designs like GS4, before the "microcontroller age") instead of DBP that uses a simple 4017 mos decade and 7556( ic1as astable and ic1b as monostable) to generate the timing sequence (these are all obsolete components now) and also analogue gates absence (4066) that are not present in DBP , supply generator and diff integrators network.
Also the switching device is not a mosfet in DBP but a bipolar device (NPN power transistor).
I don't know XR-7 but the pics posted some days ago seems to indicate that it's the same of DBP with a box that holds diff integrator stage to minimize noise and background signals (so it's maybe an evolution of basic DBP).


I think DBP is an earlier design (middle 80') that used common available devices at that time to make the same things in a cheapy way.

Best regards,
Max

[tehlab]

Sniffer7 = DBP2010 timing pulse control 556 & 4017 /output is Bipolar transistor
delta pulse = sniffer71 different timing pulse with 555 & 4038 or 4028, output is FET

all other is similar.