WANTED: VIKING 5D

[cordius]

have you this schematics?
Thanks in advance.

[Qiaozhi]

have you this schematics?
Thanks in advance.

I do not have the schematic, but I do have a scan of the front and rear of the PCB. These scans were done some time ago, but I never got around to sketching out the circuit. If anyone is interested in starting to back-engineer this, I will break open the case and note down the component values. We should be able to crack this simple design without too much trouble.

[cordius]

Thanks a lot. Someone is able to reproducing the board from the photo?
Excuse my english

[kt315]

if you will give more better photos under direct sunlight. simple PCB for redraw. where is your english from?

[cordius]

if you will give more better photos under direct sunlight. simple PCB for redraw. where is your english from?

Hallo great KT315, i'm Italian.
I'm working on the photo using sprint layout software.
I'm sure you are best of me do redraw the pcb.

[Patrick]

Thanks a lot. Someone is able to reproducing the board from the photo?
Excuse my english

To check out

[Qiaozhi]

That capability in Sprint, of tracing a layout from an image, is quite impressive.
I'll break open the case later and note down the component values.

[cordius]

Patrick thank's very very much!!!!
is possible to identify the values of the component?
Qiaozhi can you post a better photo of component side?

[Eugene52]

Amazing !!!!

Patrick , Awesome work !!!! I did not know of any Sprint version that could convert from an image to a PCB layout ....What version ???....Please let us know more !!! There are some images on this forum , especially the New up-dated Hammerhead that would be great to have in "Sprint" .LAY FORMAT !!! To me this is Great News , 2009 is starting out very Good , Thank-you again Patrick , and everyone for this new posting of information !!!!!!!..............Regards..........Eugene52

[cordius]

Patrick , Awesome work !!!! I did not know of any Sprint version that could convert from an image to a PCB layout ....What version ???....Please let us know more !!! There are some images on this forum , especially the New up-dated Hammerhead that would be great to have in "Sprint" .LAY FORMAT !!! To me this is Great News , 2009 is starting out very Good , Thank-you again Patrick , and everyone for this new posting of information !!!!!!!..............Regards..........Eugene52

HI eugene52.
I dont write well english but if you see image, you can understand how to procede to design pcb from a photo

[Qiaozhi]

Here's the layout annotated with the component values, and the attached wiring. The TX coil connects between TX and SCREEN. The RX coil is center-tapped, with the tap connected to the screen. The diode looks like a general purpose signal diode, but it is not possible to see the actual value without removing it. The variable cap has no visible markings.

[cordius]

yellow variable capacitor is 7-40 pF

ZTX502 = european BC327
ZTX712 = ???
diode will work 1n4148.

[kt315]

http://members6.boardhost.com/classi...230991259.html

[ivconic]

What a blast!?
Is that an "detector" ???
Ha,ha,ha.....
Sorry...but i expected some "machine" there, not just a simple whistler!

[Qiaozhi]

I've just back-engineered the schematic, and the coil connections are mixed-up in the last image. I will post the correct schematic later tomorrow, together with an updated PCB.

The coil housing seems to contain two coils for the transmitter circuit (1x TX and 1x feedback) while the third is used by the receiver.
The IC is an OTA (operational transconductance amplifier). It's quite a simple but elegant design, which exhibits very good ferrous rejection. It is also a non-motion detector. These are very popular low-end budget machines with quite good performance.