mickcris Posted May 25, 2018 Author Share Posted May 25, 2018 since im no longer selling these, i shared the files if anyone wants to build there ownhttps://oshpark.com/profiles/mickcris 3 Quote Link to comment Share on other sites More sharing options...
unusedowl Posted November 5, 2018 Share Posted November 5, 2018 Thanks for posting this on oshpark. Really awesome of you. Quote Link to comment Share on other sites More sharing options...
mickcris Posted November 29, 2018 Author Share Posted November 29, 2018 (edited) It has come to my attention that there is a mistake on the 7374 PCB. The 4th output is unused and is tied to ground while it should be floating. This is causing the IC to run hotter than normal. I would think the risk is fairly low as some of these have been in use for almost 2 years now. My guess would be that it running a bit hotter will cause the amp to wear out faster. Its also a possibility that the 4th channel could just go out and the chip return to normal temps. The temp its running at is still below the continuous operation long term reliability max temp. Having said that, I have not had any reports of any of them failing yet but you may want to either modify the board or discontinue using it.I tested one and after running for an hour, I measured it with my Fluke 87 meter and its running at 65 °C. With the 4th output floating the temp is 30°C. Per the data sheet:Maximum junction temperature, continuous operation, long-term reliability is +125 °CYou can fix this by lifting that leg. Here is pic with an arrow pointing to the pin that needs liftedhttps://imgur.com/a/cMeWI3lI found it easiest to just de-solder that side of the IC, lift/break off the leg, then re solder that side down.If you purchased one of these and would like me to lift the pin for you or give you a refund, send me a message and I will get back to you. I may need proof that you purchased it from me. I will only refund ones that I sold that I had soldered. If you bought one from console5 though i will lift the pin on it.If you want me to lift the pin, send me the pcb(s) along with a piece of paper with a return address and you email. I will lift the pin and then send it back.If you want a refund, send me the pcb(s) along with a piece of paper with your paypal email address. I will then send $20 to your paypal account per amp. Edited November 30, 2018 by mickcris Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted November 29, 2018 Share Posted November 29, 2018 Then I'm going to assume Luke at Console5 needs to be told about this as well? He is currently sold out but his pics of his RGB amp using the exact same layout and chip appears to have that pin grounded as well... https://console5.com/store/assembled-ths7374-rgb-pcb-for-nec-turbo-grafx-turbo-duo-pc-engine.html Quote Link to comment Share on other sites More sharing options...
mickcris Posted November 29, 2018 Author Share Posted November 29, 2018 Then I'm going to assume Luke at Console5 needs to be told about this as well? He is currently sold out but his pics of his RGB amp using the exact same layout and chip appears to have that pin grounded as well... https://console5.com/store/assembled-ths7374-rgb-pcb-for-nec-turbo-grafx-turbo-duo-pc-engine.html I let him know already Quote Link to comment Share on other sites More sharing options...
Icelvlan Posted July 26, 2020 Share Posted July 26, 2020 Are you still sharing through osh? Quote Link to comment Share on other sites More sharing options...
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