• Get involved.
    We want your input!
    Apply for Membership and join the conversations about everything related to broadcasting.

    After we receive your registration, a moderator will review it. After your registration is approved, you will be permitted to post.
    If you use a disposable or false email address, your registration will be rejected.

    After your membership is approved, please take a minute to tell us a little bit about yourself.
    https://www.radiodiscussions.com/forums/introduce-yourself.1088/

    Thanks in advance and have fun!
    RadioDiscussions Administrators

Factory Radio Help?

R

RGeek

I am trying to figure out to get more hi and mid sounds from a factory Ford AM/FM Cassette Radio. The adjustments on it muffle the hi and mid's when you crank up the bass. I'm thinking there must be a way to split the hi, mid, and low settings. It's a pet project for a friend of mine. Anyone care to lend a hand? <P ID="edit"><FONT class="small">Edited by RGeek on 10/10/05 01:50 PM.</FONT></P>
 
When you need more highs, lower the bass and turn it up. Use EQs to cut, not add.<P ID="signature">______________
</P>
 
Hopefully you have some electronics expertise. The main reason this happens is that there is some leakage through the caps (cheap) that they put on the bass section of the tone control network. They probably also have scaled down the tone control network to its absolute minimum number of components to save cost.

Several years ago, I resurrected an old National Semiconductor publication called "floobydust" - which covered these odd networks, and updated it for single supply operation:

http://www.ti.com/sc/docs/apps/msp/journal/nov2000/slyt023.pdf

The tone control network is in Figure 8 on page 43, and you should be able to find the accompanying text. What I find in a lot of cheap radios is that they delete R1 and R3 resulting in a ridiculous amount of bass increase and attenuation. Adding them back in will have the perceived effect of less bass, but it is really a better, more symmetrical network and smoother transition from "maximum" to "minimum" bass. I think you will find that the cheap kind of control has almost no effective change from 10% to 90% of pot travel, then a whole lot of boost / cut right at the extremes of the pot.

Your tone control network may be logarithmic instead of linear - depending on which bargain potentiometers they happened to get the cheapest. I'll have to help you with that if you have that type of pot.
 
Status
This thread has been closed due to inactivity. You can create a new thread to discuss this topic.


Back
Top Bottom