555 Timer Signal Module Adjustable frequency between roughly 450Hz - 1.34kHz
I don't know how I came into possession of these, but I have some tiny 555 timer based square wave generator modules that output a frequency between roughly 450Hz and 1.34kHz. The frequency is adjustable via an on-board variable resistor. These are on sale, and all must go, as this frequency range is...Well it is weird =) The module itself is small and has three leads, and each of them has a label on the board. VCC - Power supply line that requires 5-12VDC OUT - Square wave output line GND - DC Ground
The boards are very small, and specifications are listed below. If you have any questions at all, I am more than happy to answer. Please let me know.