Inexpensive Cheap Retaining Wall Ideas

DesignerDan submitted a new article: Simple, inexpensive vehicle immobilizer - This vehicle immobilizer circuit is quite possibly the smallest, simplest, cheapest and easiest to This vehicle immobilizer circuit is quite possibly the smallest, simplest, cheapest and easiest to make, install...

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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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...

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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...

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