27MHz Radio Control System, my very first one...

[hadihf]

sm6fie

Hi RC electronic buddies,

This is the very first one i made from PW 1979 issue. Feel free to ask any thing about it and I will be glad to help.

Regards

 

[hadihf]

mc3371 27mhz

Here are the project files

 

[hadihf]

mc3357p mhz

Hi,

Some more info,
Rx
L1=L2=L3=113CN2K509ADZ T/o/k/o 7mm Sheilded, P=8t, S=2t
L3 & L4 = 3rd IF Detector, Black, LLC4828 or similar
Tx
Shieded coil is as above
S18 is T/o/k/o moulded coil 0.39µH
Toroids are T37-12 M/i/c/r/o/m/e/t/a/l/s
turns are as shown on image

Regards

 

[probert]

Hi Hadihf,

Thanks for this nice project!
Just one more question: MC3357P is obsolete now, and can be hardly found. Do You know a replacement part for it. Or anyone?
Thanks,
probert

Happy New Year for All!

 

[hadihf]

These chips are similar and almost exact replacements with higher frequency range..

MC3361 ~60 MHz
MC3371 ~100MHz
MC3372 ~100MHz

Good Luck

 

[e_eja]

hi,
is there any replecement for MC3357p it's not easy to find in indonesia
any same part from other manufactureer that avlaible in indonesia

 

[e_eja]

hi,
is there any replecement for MC3357p it's not easy to find in indonesia
any same part from other manufactureer that avlaible in indonesia

 

[debutpic]

You can find similar projects here

**broken link removed**

 

[ASIC]

Where can I buy the joysticks?


ASIC

 

[hadihf]

Hi,
At that time I scraped these from an old 4ch f/u/t/a/b/a radio.
Regards

 

[ASIC]

OK

Now, for the schematic. I have a couple of questions.

RX:
==

What's the wire thickness for L3, L4, L5?


Decoder:
======

What are typical resistor values for the joysticks and R5, R6, R7, R8, C6, C7, C8, C9?


ASIC

 

[hadihf]

Hi,
for winding the toroids use 28 swg insulated wire

if Pots are 5k then C6~9 = 2.2µF tantalum and R5~8 = 150
if Pots are 100k then C6~9 = 20nF and R5~8 = 100k

with tatalums + goes to IC 4017

hope this helps

Regards

 

[hadihf]

Hi,

for rx coils use Toko 7k coils. These have slots for wires...I think 38 swg will do. for 455 coils use pre wound as wire is very very thin

If anybody needs Rx coils, or any other hard to find parts, PM and may be I can help.

Regards

 

[tic99]

MicroStar 2000

 

[hadihf]

Hi tic99,
No need to upload what is available freely on web, just post the link.

www.mstar2k.com

BTW already made Microstar2000 8) see attachments..
A super fantastic work by GAA.

Regards

 

[hadihf]

You can find similar projects here

**broken link removed**

Talking about receivers...
RX18 from above site 8) , see attachment
Regards

 

[supercool]

hi

 

[dom44]

just a point of interest old cordless phones have most of the key parts for the receiver have found resonators and 3357 as well as mc 3361 and 3362 lots beeing frown away now

 

[mhmd11]

**broken link removed**

 

[mhmd11]

**broken link removed**