Sturm - III

[ivconic]

KT315 once posted this schematic. I think it is interesting enough to be tested in practice. I like some solutions here.

[ivconic]

So i finished drawing pcb for it. Not tested yet. Intend to make it in near future and see.
Although i have some ideas about coil for this one, it would be good if author's original coil idea was offered here...

[ivconic]

I just made correction and used 7808 instead suggested 7805 (with diodes) because i will use 12V batt. not 9V batt.
12 volts input goes through 4007 diode and via wire jumper to 7808 input...

[ivconic]

I just founded one mistake! Not fatal; only + supply missing at few ic's!
Ok here are corrections.

[kt315]

ivconic, i slightly did change the schematic into side of more better understanding... look on freshed one here... nothing new... some disc part from 1265-1265... some part from MD-5008... sound amplifier ic is widely spreaded. you can find out huge amount of them on oldie sound PC cards... i did not consider all-metal mode for a simplification and in my opinion a schematic need to be more fresher sea breeze flying...
thanks.

[ivconic]

I know about that schematic too. I took another one because it looks more elementary and easier to put on small pcb.
Actually... i took it to examine in practice that oscillator and TX output. I will make that pcb soon and check all i wanted to check. If suits my expectations than it would be very easy to improve it more. I can draw pcb for this one too. But first i will check the other one.
Interesting TX output and use of multiplexer catches my eye there.

[geminis74]

Ivconic Hi, as you bring the sturm III project will soon want to do so inform us of your progress, greetings.

[ivconic]

OK.

[ivconic]

Ehhh!
I can not do it without mistakes!!!

A friend checked my pcb and there were 3 mistakes on it!

Here are corrections, this time is checked and corrected good!

Cheers!

P.S.
Ages...

[mdiede57]

Sprint Layout 5

Does anyone have have spring layout 5, or know where I can find it ?

[geminis74]

type in google sprintlayout5 + crack

[Monsterivan88]

type in google sprintlayout5 + crack

http://uploading.com/files/ab8e8765/viewlayout50.rar/

[ivconic]

My copy of Sturm III is finished. Not working. No TX output. Oscillator stage is working and producing clear 7kHz. Signal is present at 16k base resistors on input side, but not on output side (bases), meaning either signal is very weak and not enough to excite transistors, either transistor are to inert and need replacement (same $hit )...
That problem i can solve, not a big deal.
Something else is bugging me; on switching there is mum, weak background oscillator noise in speaker. Constant. Not typical. Like gates are opened all the time?
Need more job to solve this...hmmm..

[Geo]

My copy of Sturm III is finished. Not working. No TX output. Oscillator stage is working and producing clear 7kHz. Signal is present at 16k base resistors on input side, but not on output side (bases), meaning either signal is very weak and not enough to excite transistors, either transistor are to inert and need replacement (same $hit )...
That problem i can solve, not a big deal.
Something else is bugging me; on switching there is mum, weak background oscillator noise in speaker. Constant. Not typical. Like gates are opened all the time?
Need more job to solve this...hmmm..

What transistors are you use at Tx out in replacement of KT315 and KT361?? Also did you saw how strong is the signal at the in of 2R4 (1K)??

[porkluvr]

This looks like a pretty interesting detector. Can somebody explain what kind of coil and tank capacitor is supposed to be used for tx? (Rx also?)

Thanks.