| Author | Views | Views Today | Rank | Comments |
| 113,679 | 5 |   |
36 |
| Author | Views | Views Today | Rank | Comments |
| 113,679 | 5 | |
36 |
| This nifty sound level meter is a perfect one chip replacement for the standard analog meters. It is completely solid state and will never wear out. The whole circuit is based on the LM3915 audio level IC and uses only a few external components. This circuit can also be integrated into audio amp projects. |
Schematic |
Parts |
|
Notes |
Related Circuits |
Comments |
| Putting an audio signal in makes no difference. Also when I connect the power all LEDs turn bright on too how can I fix this? Any help would be appriciated, | ||
| Hi, i'm new in this kind of things, but have always loved electronics, actually thats what im going to study when i graduate, but i have two questions, all of those triangles pointing down are ground conections, right? And the second is what kind of input can i use and how do i connect it? Can i use a normal rca jack microphone, an electret microphone or what? | ||
| Built several of these, Works great. Thanks! | ||
| 1N491 diode is not available here. can you give me another as a substitute because the circuit doesn't work. i just used 4148 diode. is it ok? pls response.. tnx! | ||
| I have just built this project and i can't seem to get it to work. The problem is there are some many errors I could make here. I have a feeling it is either the PnP transistor, or the Silicon Diode. If u can help me out, plus email me. | ||
| looks nice but when i turn the power on all LEDs glow bright too, anyone knows how to fix it? thanks | ||
| Thanks for the circuit works well | ||
| It works. Used 100k pot for R4. | ||
| Thanks for the site, though im having a few problems with this circuit. I have tried making a stripboard of it and now just tried a PCB. WIth each, all of the LEDs light brightly when the voltage is supplied. Putting an audio signal in makes no difference. Any help would be appriciated, cheers. | ||
| The circuit will work with any little PNP transistor. The old version of the project doesn't work. | ||
| The last 10 comments are currently shown. Show All Comments. |
If you would like to leave a comment, you can do so using the form below. Comments can be things like suggestions, successes or failures, improvements, similar circuits, error reports, an answer to a previous commenter's question, or anything in between. However if you would like to ask a question it is suggested that you use the forum instead. The forum provides a more robust environment for discussion.
Important: If you post a technical question here, there is no guarantee it will be answered. All technical questions should be posted to the forum. The owner of this site generally does not answer questions in comments.
All comments are subject to approval before they are displayed here, so your comment will not appear immediately. This is done mainly to prevent spam and other abuse. If you wish to remain anonymous, simply enter "anonymous" for your name and/or email.