Pages: [1]   Go Down
Author Topic: Trying to make a paragliding vario .  (Read 700 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Newbie
*
Karma: 0
Posts: 3
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Hello all.

I am trying to make a vario for paragliding by copying and modifying an article in the RCGROUP article
 
http://www.rcgroups.com/forums/showthread.php?t=1749208

I asked their forum if I modified the drawing as attached would it act just as a audible vario....The answer was yes



I rigged up a breadboard with a tweeter as the audio, loaded their sketch...but not a lot happened.

a.  How should I modify their sketch to get this to work?

or should I just give up and buy a vario

Thanks John


* S1100008.jpg (113.55 KB, 1600x900 - viewed 76 times.)

* mod.jpg (154.51 KB, 1600x900 - viewed 80 times.)
Logged

United Kingdom
Offline Offline
Tesla Member
***
Karma: 227
Posts: 6637
Hofstadter's Law: It always takes longer than you expect, even when you take into account Hofstadter's Law.
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

You are effectively driving the tweeter through a 10K resistor, so it will be extremely quiet. Instead of the 10K/390 ohm/2.2uF combination, try connecting the tweeter, a 150 ohm resistor, and a 10uF capactor in series, and connect that combination between D2 and ground. It may still be too quiet for use when paragliding, but you stand a better chance of hearing it.
« Last Edit: June 11, 2013, 02:27:57 pm by dc42 » Logged

Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

Offline Offline
Newbie
*
Karma: 0
Posts: 3
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Thanks I will give that a go

John
Logged

Offline Offline
Newbie
*
Karma: 0
Posts: 3
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Thanks DC42

I tried your suggestion AND IT WORKS A TREAT!!!!!!

Thanks very much for your help

Been messing around with this issue for weeks  thanks again John
Logged

United Kingdom
Offline Offline
Tesla Member
***
Karma: 227
Posts: 6637
Hofstadter's Law: It always takes longer than you expect, even when you take into account Hofstadter's Law.
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

I'm glad you got it working. Have fun paragliding, and fly safely!
Logged

Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

Pages: [1]   Go Up
Jump to: