best inexpensive bluetooth speaker - Generation Z Gadgets
What sources or techniques/methods do you know of for large inexpensive project boxes (aka enclosures) in the USA? The components are inexpensive, consisting of a P-MOSFET (for use in the positive rail) with a dual PNP transistor and two resistors. Q1 and Q2 form a current mirror circuit that act as a differential amplifier which responds to the voltage drop across the MOSFET.
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Just wondering what can be used as an inexpensive potting compound. The commercial solutions seem fairly expensive at $40.00 for 350ml. The small 12V timer... Using the circuit presented here, you can construct a very inexpensive AGC amplifier with the following features: a dynamic range greater than 50 dB; negligible distortion to the output waveform; fast attack and slow decay; an adjustable output level from 0 to 1.2 V p-p; operation from a single 5-V supply; less than 1-mA current drain; and low cost (uses one half of a dual 8-pin op-amp package ...
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Sadly, the days of inexpensive PCBs from China are over for US citizens – you all know why so we need not discuss that. The prices from China still beat the prices from US sources in most cases, but even then, there is uncertainty in what the real cost may be with the fluctuating rule changes... Here's the first of two simple PWM control circuit using inexpensive readily-available components. The circuit component values shown are for a 12V supply but could be altered for other supply voltages less than 15V. Most of the work is done by...