T&L Publications

Hi all,<p>I had just got the last issue of Nuts & Volts and I noticed that several companies are selling LCD. Comparing to ours the prices are amazing, for example a widely used 16x2 dot character LCD with backlight, usually sold at $39 on Nuts & Volts, but I can easily get a top quality one...

I can find a seller who can sell 100pcs @ $200 But it make no sense for you because shipping charge is a little high.<p>Mike

Hi Philba<p>this filter plan may run in trouble, notice that the speed of the bicycle can be various from 5mph to 30mph, how to determin the cut-off freq of the filter?<p>I think a several hundred pf capacator between the GND and input of schmitt triger will work as the noise canceller. Only the ver...

Today I got a 128 x 64 blue OLED display panel, looked very nice, I think it can be used as substitude of most mono LCDs. <p>Drawbacks? cost, and power consumption.

usually a oscillator (or pll syntherizer) generate a step-up (or down) freq, and there's a signal detecting circuit. when the detector see a station there, it stops there (or remember the location)

Old receivers use 200kHz because they use mechanical filter for the IF.<p>465k is also widely used in asia MW radio.<p>many dual convertion shortwave receivers use 58.245M and 455k(465k) as 1st and 2nd IF.

Zener is not stable when working near the cut-off voltage. a comparator with schemitter-triger design would be more reliable but a little complicate.

You mean, blue is 100 times sensitive than red? that would be great. Is there any blue laser pen?<p>I bought red at $10, green at $80, will blue be $640??

Hi Moe,<p>I strongly suggest you using DC-DC. A simple calculator will let you know how many watt will this regulator using up: 15amp x (48-12) = 540Watt! You can use this power supply to bake your bread.<p>A 200W DC-DC power supply won't be too expensive, and it's the realizable way for you

I bought a 10mW green laser pen yesterday, comparing to another 10mw red laser beam, so amazing, the green light seems to be times powerful than the red one (when pointing to the dark sky). I think this is because of the eyes' sensitivity of green light is so much higher than red light.

reverse engineering, great, I like it

I have an 5W LED, even brighter than that 80,000 mcd one.<p>the energy efficiency of white LED is rather low, about 1/8 of fluorescent lamp. but it has advantage, it is small, light, can be powered with battery.<p>this is a 10,000-120,000 mcd device, which is the same as mine. http://img.china.aliba...

bad for me. their way is disliked by most but it seems work well, I had received many email asking me whether I accept that format, well, I can't, so they get the orders and I lost

Hi all
somebody ask me how to convert the boards designed by softwares provided by pads2pads or expressPCB into gerber so that they can be fabed by us, does anybody know how to?<p>thanks
mike

1. Hall sensor for magnetic chips, player distinguished by polarity of chips; 2. reflecting optical sensor, one side is black, the other side is white, player distinguished by strength of reflected signal; 3. color sensor, easy to handle multi players 4. whirlpool (I hope this word is correct) senso...