Electrical question
#1
#2
#3
#5
#7
The Blue wire is the antenna and just goes through a resistor.
The Pink/White wire is the phone interrupt (I think) and goes to whatever the little black component is. There are no markings on the component.
The Yellow wire is +12v and goes through the transformer to one leg of the black component ( I'm thinking it must be some kind of switch).
Trending Topics
#8
DC will pass unimpeded and any AC will be attenuated. The black component looks like a capacitor but I can not read what is written on it.
You can increase the filtering by adding a capacitor across the transformer. A large Electrolytic 200uf 100v in parallel with a small 0.01uf ceramic.
Last edited by warrjon; 05-23-2018 at 03:20 AM.
The following users liked this post:
petemohr (05-22-2018)
#9
#10
I was hoping the other side helps to understand what this board is for, but it wasn't much help. Elements with three legs are usually transistors or thyristors. (The latter has not much use in DC circuits.)
#11
No, this will not increase filtering (except for tuned filters used for high frequency, not the case here). Capacitor can be used to suppress the voltage spike which occurs when voltage source is disconnected. (The same effect is used in ignition coils to induce spark.) BTW, all units named after person are uppercase. Thus, it is V, W, A, Hz, etc. (Not v, w, a, hz.))
Any LC filter can be tuned for any frequency it can be from a few Hz in a speaker Xover to the fine tuning circuit on the output of a YIG oscillator at a few GHz.
The capacitor will increase the slope of the filter, if we use a speaker Xover as an example a simple inductor in series as a lowpass filter will give a rolloff of 3dB per octave if you add a capacitor across the speaker the rolloff will double to 6dB/oct.
#13
Hi Guys
I know absolutely nothing about Auto-Electronics but I wanted to swap out the Original Stereo for a much more modern one on my Car 'Cherry Blossom'
Which was surprisingly very easy to do, so this could viewed as a 'step by step guide' for anyone who is thinking of doing the same
But referring to your Question Pete (Petemohr) I did have to cut off the 'noise suppressor' to give me a bit more room to fit the New Stereo
Which didn't make any difference to the Sound Quality, or not that I was able to detect, where the reason that I mention it is that this 'noise suppressor' only had one wire
Which is on Page: 61 of my 'Cherry Blossom' restoration thread, which happened to be the very day that 'Cherry Blossom' was finally finished and put back on the road
Link to Page: 61 https://www.jaguarforums.com/forum/x...122634/page61/
(As an aside this also includes one of my favorite reggaeton dance tracks)
I know absolutely nothing about Auto-Electronics but I wanted to swap out the Original Stereo for a much more modern one on my Car 'Cherry Blossom'
Which was surprisingly very easy to do, so this could viewed as a 'step by step guide' for anyone who is thinking of doing the same
But referring to your Question Pete (Petemohr) I did have to cut off the 'noise suppressor' to give me a bit more room to fit the New Stereo
Which didn't make any difference to the Sound Quality, or not that I was able to detect, where the reason that I mention it is that this 'noise suppressor' only had one wire
Which is on Page: 61 of my 'Cherry Blossom' restoration thread, which happened to be the very day that 'Cherry Blossom' was finally finished and put back on the road
Link to Page: 61 https://www.jaguarforums.com/forum/x...122634/page61/
(As an aside this also includes one of my favorite reggaeton dance tracks)
Last edited by orangeblossom; 05-27-2018 at 04:59 PM.
The following users liked this post:
petemohr (05-27-2018)
#14
Even a common garden variety transformer will help filter common mode noise through its parasitic capacitance. CMN is a bugger because it is the same polarity on both conductors it does not present a potential difference to the load, so its only path to ground is via parasitic capacitance.
CMN is not really an issue in this type of installation, even the cheap power supplies have CMMR (common mode rejection ratio) of 100dB which is 100,000:1. CMN can be a real issue in high speed data and low signal audio like a turntable.
I suspect the circuit is a noise filter either LC or CL to filter alternator whine, which can not be filtered with just capacitance to ground.
Thread
Thread Starter
Forum
Replies
Last Post
Magnetvision
XK8 / XKR ( X100 )
5
06-18-2011 06:53 AM
H20boy
Audio/Visual Electronics
42
02-18-2011 10:21 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)