Sunday, May 10, 2009
Bath level alarm
I was sick of continually checking the level of the bath when it was running so came up with this contraption:
The 104dB two-tone speaker (you can see the beige screw lugs either side of the black box) is a bit loud but all you have to do is lift the whole thing up to pull the white sensor wires out of the water....
Labels: alarm, circuit, electronics, water level detector
Thursday, April 16, 2009
Spectrum 128 (toastrack) RGB cable
Click an image for a larger version.
Fortunately I remembered before I went to Maplin this morning that the circuit I was thinking of yesterday was for the +2, not the toastrack 128. Basically, instead of 330 ohm resistors, I needed six 150ohm, one 15ohm, and three diodes (1N4148).
I will add in the MIC feed tomorrow, but it was nice that the cable worked first time
Fortunately I remembered before I went to Maplin this morning that the circuit I was thinking of yesterday was for the +2, not the toastrack 128. Basically, instead of 330 ohm resistors, I needed six 150ohm, one 15ohm, and three diodes (1N4148).
I will add in the MIC feed tomorrow, but it was nice that the cable worked first time
Labels: circuit, rgb cable, schematic, Sinclair ZX Spectrum 128
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