![]() ![]() ![]() It's not a computer and it's not a clock, but for less than £100 it's solid and reliable. The unit is ideal for the way I use mine as a backup device and to monitor my run time. However, if you don't know if you've been down for 15 minutes, an hour and 15 minutes, or 2 hours and 15 minutes, then you probably shouldn't be relying on dive technology to keep you safe anyway! (8) Finally, some users have complained that, after the 59th minute, the timer resets to 00 with a small "1 hour" logo beneath the time (which is not immediately obvious if you only glance briefly at the face). (7) There's no backlight (though without any underwater controls it wouldn't be much use anyway). The memory function can tell you how long your dive was, but, the only way to calculate your 'jump' time is to work out your surface interval and then deduct that time from the actual time taken from another device. (6) The unit is a timer and not a watch! It doesn't actually have a 'clock' function at all. However, it is a little too big to be able to wear comfortably on the side of the wrist (which is where it would be handy to have it when - for example - driving a DPV). Despite what you might think from the photo - this is not a 'wrist watch' sized timer - it is the size of an average dive computer! It can be worn quite comfortably either on the inside or the outside of either wrist. ![]() (5) Many people are surprised by the size of the unit. The only complaints people seem to have about this device are - in my view - based on unrealistic expectations. But, as a back up timer, you can simply jump in to the water and rely on it to start reliably. Of course, you should always check your primary timer before a dive to make sure that it's working. (4) The device starts up quickly and automatically from 'cold' as soon as it gets wet. The dive time is clearly visible alongside a large and clear depth readout which makes it a perfect device for checking your depth and time against a plan. (3) The interface is tidy and nicely laid out. The system works very well indeed and adds to the general feeling of robustness of the unit. Rather than buttons, the three metal 'studs' are used to control the device by simply licking your fingers and tapping them. (1) The unit itself is sturdy enough and comes with a solid chunky black plastic wrist mount with a buckle which is easy enough to manipulate even with gloves on. I've worn it below 50m though, as the name suggests, it is rated to 330m: 01uF Gnd.I bought this timer as a back-up for my main computer and for monitoring my run time against plans for mixed gas decompression dives. After 10 minutes, set by the 500K potentiometer R1, the 'Red'led will light to warn the operator that he must identify 6 Reset 5 1 150uF Fig. To begin the cycle, the reset switch is pressed which causes the 'Green' led to light up. The 555 is used as a one-shot so that a visual warning indicator becomes active after 10- minutes. This can be a problem, especially during lengthy conversations when it is difficult to keep track of time. The Federal Communications Commission (FCC) requires the ham radio operator to identify his station by giving his call- sign at least every 10 minutes. Ten-Minute Timer: 10-Minute Timer + 9V "ID" Red 110K 330 500K 3 2 330 555 2M2 Green Timer Oscillator 7 NO Can be used as a time-out warning for Ham Radio. 555 IC Circuit Monostable Touch-Timer 'On for a Time' o 0 O 9V SW1 R2 10M R3 1K 8 4 DI RS V+ R1 7 470 3 OP TH 6 N 2 C2 470uF IC1 TR V- CV NE555 15 VR1 5K D1 A Touch Contacts C1 2200uF = O OV Circuit (42) 112 Working Circuits
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