<div dir="ltr">Maybe just pull the battery out of your car for a while and use that for testing? Make sure you've got some jumper cables and a friend with another car to give you a jump start if your battery is too low after your tests are done. <div><br></div><div><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr">Tim (might as well jump) Servo<br>---<br>"Imagination is more important than knowledge." - Albert Einstein<br><br><br><br></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Jul 2, 2023 at 2:15 PM Jean-Pierre Desrochers <<a href="mailto:jpdesroc@oricom.ca">jpdesroc@oricom.ca</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-4730245048950849564"><div lang="FR-CA" style="overflow-wrap: break-word;"><div class="m_-4730245048950849564WordSection1"><p class="MsoNormal">I forgot to say in my previous post that I tried using an external power supply<u></u><u></u></p><p class="MsoNormal">To simulate a battery but that didn’t work. The charging circuit takes over<br>on the ext supply and there is no way I can vary the ext supply voltage.. <br>The needed battery simulator circuit should have a trimmer so I can adjust the voltage<br>to simulate a discharging battery. (There are threshold voltages in the charging circuit that needs to be tested)<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">******************************</p><p class="MsoNormal"><u></u> <u></u></p><p class="m_-4730245048950849564MsoPlainText">Hi list,<u></u><u></u></p><p class="m_-4730245048950849564MsoPlainText"><u></u> <u></u></p><p class="m_-4730245048950849564MsoPlainText">I have a battery charger circuit that I need to fix and do some tests on..<u></u><u></u></p><p class="m_-4730245048950849564MsoPlainText">It is supplied from a 15VDC (22VDC actually) at 1.2amp and its job<br>is to charge a 12VDC 9AH battery for a small CRATE TAXI TX-50D portable guitar amplifier.<u></u><u></u></p><p class="m_-4730245048950849564MsoPlainText">Its battery is done with a very high ESR value.. No recharging possible.<u></u><u></u></p><p class="m_-4730245048950849564MsoPlainText">Now before I go buy a new one I’m Looking for a simple circuit that simulates this type of battery (12V 9AH)<u></u><u></u></p><p class="m_-4730245048950849564MsoPlainText">And will be connected to the battery terminals of my charger..<u></u><u></u></p><p class="m_-4730245048950849564MsoPlainText">Any clue what this circuit would look like ?<u></u><u></u></p><p class="m_-4730245048950849564MsoPlainText"><u></u> <u></u></p><p class="m_-4730245048950849564MsoPlainText"><span style="color:black"><img width="590" height="510" style="width: 6.1458in; height: 5.3125in;" id="m_-4730245048950849564Image_x0020_1" src="cid:1891884ac546917eb1"></span><span style="color:black"><u></u><u></u></span></p><p class="m_-4730245048950849564MsoPlainText"><span style="color:black">Here is my charger schematic section :<u></u><u></u></span></p><p class="m_-4730245048950849564MsoPlainText"><span style="color:black"><img width="1354" height="521" style="width: 14.1041in; height: 5.427in;" id="m_-4730245048950849564Image_x0020_2" src="cid:1891884ac547745b42"></span><span style="color:black"><u></u><u></u></span></p></div></div>_______________________________________________<br>
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