• 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

Dim Frequency Display on Exciter Fix

K

kf4rca

Guest
The emitters and collectors are reversed on Q4 - Q7, the display drivers. The schematic is correct. This can be verified by observing that the collectors connect thru R5 (10 ohm) back to VCC. On the schematic the emitters connect to R5.
The easiest fix for this is to remove the 4 SOT 23 transistors, "flip" them, and resolder. The base connection does not change. Best to use some adhesive before resoldering.
 
Status
This thread has been closed due to inactivity. You can create a new thread to discuss this topic.
Back
Top Bottom