Log in
Register
Menu
Log in
Register
Home
What's new
Latest activity
Authors
Forums
New posts
Search forums
What's new
New posts
Latest activity
Members
Current visitors
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
2 way splitter
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="a33" data-source="post: 1109413" data-attributes="member: 332642"><p>I looked into this, again.</p><p>I can now imagine that it can work, because of the <strong>collector and emitter</strong> of the switching transistor <strong>being interchanged</strong>; as in contrast with the setup for the transistor in a normal current flow.</p><p>But I'm not a electronics specialist at all, I must confess; so this is just all an assumption by me now.</p><p></p><p><strong>I guess this can only work when there is a resistor between base and emitter(new collector), so that a small switching voltage/current can flow between base and collector(new emitter), that starts the 'emitter-collector current'. A resistor, such as in schematics as this: <a href="http://juras-projects.net/images/diseqccirc2.png" target="_blank">http://juras-projects.net/images/diseqccirc2.png</a></strong></p><p><strong>(e.g. R5, 10k, for transistor VT6-1)</strong></p><p>So I guess it might not work when the switch has NO such resistor added, such as in schematics like this: <a href="http://juras-projects.net/eng/info.php#diseqc" target="_blank">Misc Info - Juraś-Projects</a></p><p>(no resistor at switching transistor e.g. VT6)</p><p></p><p>However, <strong>the transistors are not made for this use</strong>. I'm not sure if they will always survive (even with motor current?). <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite53" alt=":confused" title="Confused :confused" loading="lazy" data-shortname=":confused" /></p><p>In fact, after reading some topics on the internet about this collector/emitter swapping: it might be that normal diseqc switch operation might be problematic, after this use.</p><p></p><p>And when you've one receiver on 13V, and another at 18V, there is no protection for the receivers to prevent possible damage. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite74" alt=":wacko:" title="Wacko :wacko:" loading="lazy" data-shortname=":wacko:" /></p><p>That is why I wouldn't prefer to use this method, frankly. In cases like this, I'd rather take an old splitter, 'empty' it from its contents, and put some diodes in it (and maybe some capacitors). That would do the same job, WITH the voltage protection.</p><p></p><p></p><p>But, it is special to know that it works! Maybe some people would like to use this method. <img src="https://www.satellites.co.uk/styles/default/xenforo/smilies/smile.png" class="smilie" loading="lazy" alt=":)" title="Smile :)" data-shortname=":)" /></p><p></p><p>greetz,</p><p>A33</p></blockquote><p></p>
[QUOTE="a33, post: 1109413, member: 332642"] I looked into this, again. I can now imagine that it can work, because of the [B]collector and emitter[/B] of the switching transistor [B]being interchanged[/B]; as in contrast with the setup for the transistor in a normal current flow. But I'm not a electronics specialist at all, I must confess; so this is just all an assumption by me now. [B]I guess this can only work when there is a resistor between base and emitter(new collector), so that a small switching voltage/current can flow between base and collector(new emitter), that starts the 'emitter-collector current'. A resistor, such as in schematics as this: [URL]http://juras-projects.net/images/diseqccirc2.png[/URL] (e.g. R5, 10k, for transistor VT6-1)[/B] So I guess it might not work when the switch has NO such resistor added, such as in schematics like this: [URL="http://juras-projects.net/eng/info.php#diseqc"]Misc Info - Juraś-Projects[/URL] (no resistor at switching transistor e.g. VT6) However, [B]the transistors are not made for this use[/B]. I'm not sure if they will always survive (even with motor current?). :confused In fact, after reading some topics on the internet about this collector/emitter swapping: it might be that normal diseqc switch operation might be problematic, after this use. And when you've one receiver on 13V, and another at 18V, there is no protection for the receivers to prevent possible damage. :wacko: That is why I wouldn't prefer to use this method, frankly. In cases like this, I'd rather take an old splitter, 'empty' it from its contents, and put some diodes in it (and maybe some capacitors). That would do the same job, WITH the voltage protection. But, it is special to know that it works! Maybe some people would like to use this method. :) greetz, A33 [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
2 way splitter
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top
