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The Device is a monolithic integrated high volt-age, high current four channel driver designed toaccept standard DTL or TTL logic levels and driveinductive loads (such as relays solenoides, DCand stepping motors) and switching power tran-sistors.To simplify use as two bridges each pair of chan-nels is equipped with an enable input. A separatesupply input is provided for the logic, allowing op-eration at a lower voltage and internal clamp di-odes are included.This device is suitable for use in switching appli-cations at frequencies up to 5 kHz. The L293D is assembled in a 16 lead plasticpackaage which has 4 center pins connected to-gether and used for heatsinkingThe L293DD is assembled in a 20 lead surfacemount which has 8 center pins connected to-gether and used for heatsinking.
Jason M Sturdevant
Reviewed in the United States on May 25, 2024
I accidently a pulled a stupid stunt. I aligned my Celestron NexStar Evolution 8 telescope with my phone via Wi-Fi. I was then trying to take a short video of Jupiter using my phone through the eyepiece, and was irritated having to switch between my camera app and the SkyPortal to keep Jupiter perfectly centered, so I had the bright idea of slewing with the hand controller. Unfortunately, I then heard a 'POP' noise and smelled a wisp of electronic smoke. All the features of the mount still worked (Wi-Fi, Adjustable LEDs, charging, etc.) but neither Alt/Az motors would move. I purchased the mount used, so it is not under factory warrantee, so I took to the forums to see what the problem was and if/how to fix it.After opening the mount case, conducting some diagnostics, and spending a few hours reading forums, I determined that the problem was likely a fried L239DD motor chip. A new mother board for this specific telescope costs several hundred dollars, so I figured I'd try to replace this chip first, and hope there was nothing else wrong.After reworking this new L239DD chip, the telescope fired up and worked perfectly! I have used it for tens of hours since then and have not had any further problems. Plus I have four spare chips.. just in case. Since then, I have also gotten a dedicated astronomy camera. :)
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