Here we track down the cause of the speaker output relays not switching on for a delayed period then switching off with a chattering effect.


Tools I use -

Soldering
Quick 861DW hot air station
Duratech TS-1640 solder iron

Multimeter
RMM760D - can be found under many name badges

Microscope
Luzky Zoom 3.5 - 90x simul-focus single boom stand trinocular stereo microscope
Camera - Lucky Zoom HD 14MP

Oscilloscopes
Siglent SDS 1102CML 100MHz 2CH
Philips PM 3305 35MHz 2CH

Bench supply
Powertech MP-3086 0-30V 3A

TL866II PLUS universal EEPROM programmer

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