Products > Test Equipment
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001:
:-+ :-+ :-+ :-+ :-+ :-+
Scratch.HTF:
I've built an AC series load limiter for testing things under repair to reduce the possibility of catastrophic failure: http://github.com/brycecherry75/SeriesLoadLimiter
The case I used was a bit small, but everything fitted in OK - the rocker switch on the side switches the load (not controlled by the Arduino sketch) while the rocker switch on top is used for bypassing the current limit and the green LED is used to indicate that the load is enabled (which will flicker/dim when peak current is being limited and is faster than the LCD display) and finally, the pushbutton is used for configuring the unit (and refreshing the LCD when back EMF countermeasures are enabled should back EMF (even though I took precautions) cause it to blank).
Bud:
HF Antenna tuner.
Bud:
GPIB / USB adapter.
pqass:
Soldering Station for Weller PES51 iron
Chips in CW order: LM358, LM329 (zener), DIP resistors, ATMEGA328, ULN2003 clone, HEF4017
On back: LM7508, IRF640
Notables: Uses 20V@3A laptop power brick. 7-segment display shows set temp. (°C) as the rotary encoder is turned then current temp. when stopped.
4W into 4ohm stereo amplifier for 2-way bookshelf speakers for desktop computer audio duty
Based on this design https://sound-au.com/project113.htm but with darlington transistors.
Notables: I accidentally shorted one of the transformer secondaries and burnt the enamel coating. I ended up spending a few hours rewinding it for just one ±12VAC secondary. I won't make that mistake again.
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