Andy Flind MFD.

[abdou2014]

I'm sorry, I have clone Alonso-PD schematic ,

[indiana jones]

Hi.
All these years i received so many mails to post the schematic of Andy Flind.
Today i decided to post it here.
Article is in PDF format and it is from EPE magazine.
I would like Admin to tell me if i can do it or No. Article is from year 1995.

Regards

Thanks Geo

for me, one of the best lrl

[Geo]

Hi Chris, how are you.
Try this project, maybe to have good results at your are.

[Geo]

I'm sorry, I have clone Alonso-PD schematic ,

So you can use the beep generator from PD. A 100nf at input is ok.
Try to connect it to output of IC4.
IC5 is a tone generator, we don't need it because beep generator uses beeper with internal oscillator.

[abdou2014]

Thank you Geo !

Beep generator from PD !

[abdou2014]

.

[Geo]

It is good to connect a 10nF from pin5(555) to earth

[abdou2014]

I'll do it, thanks, I have questions, is it better to add a radio to this device ?

and how to connect the radio to the beep generator ?

[Geo]

Not for the time. First "play" with it so to see the problems and to find the solutions and later if you like you can add a radio.
You must connect it to beep generator (from volume potentiometer).

[abdou2014]

I put nothing between the radio and the beep generator to amplify ?

[Geo]

I put nothing between the radio and the beep generator to amplify ?

A capacitor 100...470n is neccessary

[abdou2014]

ANDY WITH DIGITAL DISPLAY

[Geo]

I attach a preamplifier suitable for this device.
If you will look carefully will see that it is the same amplifier (first 2 stages) of passive receiver from Alonso.
Also the same preamplifier uses the Cryfton OBND1?????????

[abdou2014]

Is that right ?

[Geo]

I attach a preamplifier suitable for this device.
If you will look carefully will see that it is the same amplifier (first 2 stages) of passive receiver from Alonso.
Also the same preamplifier uses the Cryfton OBND1?????????

Sorry i forgot to attach