How to make a Geophone Vibration Detector
Автор: Infraready Ghost Hunting Equipment
Загружено: 2018-09-15
Просмотров: 8454
Описание:
Tutorial of how to make a simple geophone for Ghost Hunting
You will require 5 parts
1) 9v project Box enclose
2) 2oz lead fishing weight
3) Piezo - suggest getting one with a tall plastic cover that can be popped off. The weight can the be put inside the housing and then seal back in place. This holds the weight in place when the build has been assembled.
4) 9v battery clip
5) LM3915 10 LED Audio Level Indicator
DIY VU Meter Preamp Power Amplifier Indicate
eBay Description for circuit.
This is 10 Segment LM3915 level indicator board (Assembled). Board with an level amplification(use 741 single operational amplifier), there have high and low two group input. it can be used for pre-amplifier output level indication.
Power Supply: DC 12V 250mA
11PCS 3mm LED lights, 10pcs LED used for level indicating, 1pcs LED used for power indicator. colour assortment: 7pcs Green color, 3pcs Yellow color, 1pcs Red color.
Input sensitivity:
Low input： 150mV to 6V rms (47K)
High input： 1.5V to 60V rms (470K)
Size: 35 x 70mm
Weight: about 20g
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