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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

lm3915

  1. humanNPC

    LM3915 cascaded dot/bar mode switch

    Does this work? i added a resistor and a switch to the circuit of the datasheet... LM3915 (page 11, Pin9 internal circuit on page 9) VCC 12V V LED PWM 5V while in dot mode pin 9 is reverenced to LED9 minus 600mV and if below that threshold LED10 is switched off, this should work since the...
  2. Super-Dave

    Truncated VU-Meter

    I'm planning on building a VU-Meter/Spectrum Analyzer for a car stereo. The case it is to fit into is a standard DIN chassis(50mm tall & 180mm wide). That's the WINDOW, the actual case is a little bigger. There's room to stack 5 rows high, and 34 LEDs across using 3mm LEDs. Each "row" will be a...
  3. M

    Complete newbie needs help with LM3915 VU Meter Circuit

    Just started with electronics a few days ago. I decided to build a microphone based VU meter using LM3915 and NE5532 for my first project. I wired the LM3915 according to the datasheet for a scale between 4.5 V and 7.5V together with some preamp schematic I found on Google. I really should have...
  4. ClydeCrashKop

    Interfacing Arduino with LM3915

    After searching the internet, I got a lot of clues but no answer. Here is the answer. The LM3915 bar / dot display driver wants an analog input up to 1.25 volts where the tenth LED comes on. Arduino analog output is actually PWM at 5 volts, using a 5 volt supply. This gets a smooth voltage...

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