Tanis is podcast series, now ended, and I wanted to download it. Here's what I did. Read More

I was trying to install nvidia drivers  beacause the screen latency was s l o o w. Eventually I goto the point where I gon black screens with a brief message about unsupported resolution. Just for on user though. I created a new user just to to tst this and coul log in to KDE normally. Read More

I use a USB radio dongle with rtl_433 to log data from several devices, like rainfall, temperatures etc. I recently bought a wireless doorbell and rtl_433 will receive the bell push data too.  It came with a receiver that uses up another mains socket but I had a better idea. Read More

From an online formum I got this:
 

Main Board
Power Amp Caps – Nichicon KG 4700uf 80v x2 (Parts Connexion) – these are 5mm wider than the original Su’scon items, but interestingly the screen printing on the main board has a placement outline exactly the same diameter as the Nichicons so they clip in without fouling any adjacent components.

Digital Amp Board (DS-150)
Power Transistors – Vishay IRF9640PBF / IRF640PBF (Mouser)
Electrolytic Caps - Nichicon EP (Bipolar) 10uF 100v 105C (Mouser)
Opamp - Texas Instruments TL072BCD (Mouser) – has a lower input offset voltage (3mv) than the original ST Microelectronics TL072CDT (10mv)

Relays – Omron G2RL-1-E-24VDC 16A x2 (Rapid) - The original speaker relay is a Goodsky 5A DPDT with the two poles paralleled on the circuit board input/output tracks, the Omron 16A SPDT has the same terminal layout and works fine. The original power relay is a Goodsky 16A SPST, but the power board has the extra through holes for a SPDT layout blanked off with solder, so you can open up the holes on the board to take the Omron. The Omrons are approximately 2/3 the height of the Goodskys as well.
 

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I have a pi that takes temperature reading every 5mins and receives rtl_433 as and when.  These data are compiled into a web page and served up by the same Pi. SDCards do not like this. Read More