I'm building a large Spectrum Analyzer to go on my wall in my room. It's my first big electronic project, and I don't want to order all the wrong parts, or mess it up in some other way.
Parts list:
(http://imgur.com/CTBty)
How it works:
1) Audio is split (using a simple passive splitter) between the SA and an Audio System
2) Audio is sent to 12 bandpass filters
3) Each filter sends their signal to the bar graph driver
4) The bar graph driver lights up LEDs (ping pong ball halves diffuse the light)
I used this PDF to calculate values for each filter.
- Am I missing anything important, or using the wrong parts?
- When I test a bandpass filter using a frequency generator set at 5khz, and oscilloscope, the output is only brought down by about half (at higher frequencies, the output gets to near zero). Is that normal, and will it affect the end result?
- Am I using good frequencies for the bandpass filters? They range between human hearing capabilities, but I have no idea what the distribution should be.
- My power supply is a dual 12v 2a. Each of the LEDs are 20ma, but wont all be lit at the same time. Should I get a higher amperage supply? Also, is 12v too much?
Thanks for any help!
Parts list:
- 13x Caps and resistors on Bandpass chart (Below)
- 13x LM358 Dual Op Amp
- 13x 8 Pin DIP Socket
- 150x 5mm Ultra Bright LED
- 13x LM3914 Bar Graph Display Driver
- 13x 18 Pin DIP Socket
- 13x 6 Pin Male Connector
- 13x 6 Pin Female Connector
- 26x 10k potentiometer
- 26x Toggle Dip Switch
- 13x 1uf Cap
- 13x 1k resistor
- 130x Ping Pong Ball Halves
- 10x Each Colour of AWG 22 Wire
- 1x Dual Power Supply
- 2x 3.5mm Stereo Male Jack
- 4x 3.5mm Stereo Female Socket
- 13x 94x53mm Strip board
(http://imgur.com/CTBty)
How it works:
1) Audio is split (using a simple passive splitter) between the SA and an Audio System
2) Audio is sent to 12 bandpass filters
3) Each filter sends their signal to the bar graph driver
4) The bar graph driver lights up LEDs (ping pong ball halves diffuse the light)
I used this PDF to calculate values for each filter.
- Am I missing anything important, or using the wrong parts?
- When I test a bandpass filter using a frequency generator set at 5khz, and oscilloscope, the output is only brought down by about half (at higher frequencies, the output gets to near zero). Is that normal, and will it affect the end result?
- Am I using good frequencies for the bandpass filters? They range between human hearing capabilities, but I have no idea what the distribution should be.
- My power supply is a dual 12v 2a. Each of the LEDs are 20ma, but wont all be lit at the same time. Should I get a higher amperage supply? Also, is 12v too much?
Thanks for any help!