RadioReference on Facebook   RadioReference on Twitter   RadioReference Blog
 

Go Back   The RadioReference.com Forums > Scanners and Receivers Forums > Radio Shack Scanners

Radio Shack Scanners A forum for the discussion of all Radio Shack scanning radios and receivers.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 09-18-2011, 11:10 AM
Member
  Shack Photos
Shack photos
Audio Feed Provider
Audio Feed Provider
Amateur Radio Operator
Amateur Radio
 
Join Date: Sep 2011
Location: Waller, Texas
Posts: 13
Default Pro-95 speaker mod?

Hi, new forum user here, not new to scanners, or any type of radio equipment, but I do have a question about this scanner, the Pro-95 older model dual trunking from Radio Shack....

I remember programming one of these years ago for someone, and the audio is not very loud from the internal speaker. Does anyone know what replacement speaker or some other mod (like maybe a higher gain transistor for the audio output circuit and it's location on the circuit board)?

Just thought I'd ask, I got one the other day off Ebay for $61 shipped. Figured couldn't pass that up, I don't often need a handheld, but lately with the wildfires here in Texas it would be nice to have a handheld. This county is still on TxWARN Analog 800mhz Motorola Type II Smartzone so the Pro-95 will work just fine for that.

Thanks in advance!

Chris
KF5JMD
Reply With Quote
Sponsored links
  #2 (permalink)  
Old 09-19-2011, 8:23 AM
DickH's Avatar
Member
   
Join Date: Mar 2004
Posts: 3,487
Default

Quote:
Originally Posted by kf5jmd View Post
... the audio is not very loud from the internal speaker. Does anyone know what replacement speaker or some other mod ...
Adding a jumper to bypass the audio limiting resistor should boost the audio.
http://dickh.zenfolio.com/img/v15/p582679332-3.jpg
__________________
Dick H
http://dickh.zenfolio.com
Reply With Quote
  #3 (permalink)  
Old 09-19-2011, 10:46 AM
Member
  Shack Photos
Shack photos
Audio Feed Provider
Audio Feed Provider
Amateur Radio Operator
Amateur Radio
 
Join Date: Mar 2002
Location: Flower Mound, TX
Posts: 1,472
Default

I have done this mod for using an EXTERNAL speaker and it works great. If the internal speaker has gone bad, a replacement is available from places like Digikey or Mouser
__________________
Doug
Pro2B/40/43/77/83/84/89/96/97(2)/99/106/107/137/164(2)/2026
BC235 BC245 SC230 ICR3, ICR10
+ HF, VHF & UHF Xceivers from Alinco Icom Kenwood Yaesu Vertex Maxon Mot & RS
Reply With Quote
  #4 (permalink)  
Old 09-19-2011, 11:02 AM
Member
   
Join Date: Jun 2002
Posts: 1,465
Default

Quote:
Originally Posted by DickH View Post
Adding a jumper to bypass the audio limiting resistor should boost the audio.
The internal speaker has no limiting resistor. The resistor you referenced is only connected to the earphone jack. The audio amplifier chip is a type NJM2070 powered by a 5 volt regulator. It can only ouptut about 0.3 Watt of audio power so the volume capability is limited.
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 4:52 AM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
All information here is Copyright 2012 by RadioReference.com LLC and Lindsay C. Blanton III.Ad Management by RedTyger
Copyright 2011 by RadioReference.com LLC Privacy Policy  |  Terms and Conditions