A few months ago, I received this Onkyo PE-C50 stereo graphic equalizer from a friend because it was not working. He gave me this equalizer for free because he was planning to discard it due to some problems with its controls. Front panel of the Onkyo PE-C50. The Onkyo PE-C50 is a vintage, 7-channel, stereo digital graphic equalizer. This unit is manufactured in Japan and operates on 110V AC power only. Front panel controls allow me to adjust each channel separately or simultaneously. This unit also got 5-channel preset memory to save graphic equalizer settings. Besides a graphic equalizer, it comes with an attractive 2×7 channel spectrum analyzer. At initial testing, I found that the unit's controls and spectrum analyzer would randomly stop working. After controls at the front panel freeze, I have to restart it to get it back in working condition. PCB of the Onkyo PE-C50 graphic equalizer. To troubleshoot, first, I try to find the service manual for this equalizer, but I couldn&
This blog contains electronic, amateur radio, and embedded system projects, which I did during my free time. Unless otherwise noted, all the articles and projects described on this blog are based on my original designs.