The British Caving Association

Some more info - because I'm building one more set I get some new experiences. The main issue is that the part list is really out-of-dated and some parts have wrong values or does simply not exist (eg. U18/U19). 1. TOKO filters are only available from JabDog company. 2. The main transformer can be f...

Any idea how many of these PIC controlled HeyPhones have been built? At least two in Netherland and at last two by me here in Poland ;) Rob, maybe there is a time to re-design the HeyPhone and use a uC for generating some signals? That will cause simplification of the construction and a reduction i...

That's the valid URL: http://www.vollok.nl/projects/pic_controlled_caveradio/ with all the data. I wrote to Danny an email with the answers to questions he had but some issues may be also valid for others: R46 should be 47k. R107/108/109 should be 180ohm but it depends on the LED color. R104/105/106...

Hello all! I believe the Toko 360 µH inductors are no longer made, but John Hey uses small fixed inductors of 330 micro henries (they look like 1/4 W resistors and are made by many companies). He adjusts the value of the parallel capacitor (originally 10 nF) so as to achieve resonance. I'm trying to...