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Junior Varsity
JBL PRX series auto-off disable?
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<blockquote data-quote="Danny Avila" data-source="post: 214264" data-attributes="member: 2957"><p>Hi <img class="smilie smilie--emoji" loading="lazy" alt="🖖" title="Vulcan salute :vulcan:" src="https://cdn.jsdelivr.net/joypixels/assets/7.0/png/unicode/64/1f596.png" data-shortname=":vulcan:" />.</p><p></p><p>The input module has an OpAmp circuit that <em>senses</em> the signal level and translates it to a positive voltage in the correspondent CPU pin, so it can control the <em>obnoxious</em> power saving option of this particular batch of PRX700 Series. As I have not any one of these at hand by now, I can't measure the max voltage level necessary in the pin <strong>SDETECT</strong> to keep the system alive and performing, but doubling R44 and R48 resistor values to 220K Ohm and C57 to 0.33uF will improve sensibility in the OpAmp (+) input pin and it will keep its output on Hi level with smaller signal fed to the loudspeaker, so the CPU senses the audio input as active and keeps the amp enabled with lower levels of input signal.</p><p></p><p>I attached a section of that circuit to locate the parts in the Input board.</p><p></p><p><img class="smilie smilie--emoji" loading="lazy" alt="🎤" title="Microphone :microphone:" src="https://cdn.jsdelivr.net/joypixels/assets/7.0/png/unicode/64/1f3a4.png" data-shortname=":microphone:" /></p></blockquote><p></p>
[QUOTE="Danny Avila, post: 214264, member: 2957"] Hi 🖖. The input module has an OpAmp circuit that [I]senses[/I] the signal level and translates it to a positive voltage in the correspondent CPU pin, so it can control the [I]obnoxious[/I] power saving option of this particular batch of PRX700 Series. As I have not any one of these at hand by now, I can't measure the max voltage level necessary in the pin [B]SDETECT[/B] to keep the system alive and performing, but doubling R44 and R48 resistor values to 220K Ohm and C57 to 0.33uF will improve sensibility in the OpAmp (+) input pin and it will keep its output on Hi level with smaller signal fed to the loudspeaker, so the CPU senses the audio input as active and keeps the amp enabled with lower levels of input signal. I attached a section of that circuit to locate the parts in the Input board. 🎤 [/QUOTE]
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Junior Varsity
JBL PRX series auto-off disable?
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