Hello Dick and the group, there are many MOSFET drivers on the market. Some examples: Maxim MAX626/627/628 www.maxim-ic.com International Rectifier IR21xx / IR21xxx www.irf.com Intersil HIP408x, ICL7
Dear All, Bernt SM6BHZ asked me to send the following information to the LF reflector: Today, January 15, the amateur radio club of Gothenburg (GSA) will transmit a special programme on medium wave t
Hello all, In case you didn't know, Joe Taylor W1JT won the Nobel prize in physics in 1993: http://www.arrl.org/news/stories/2002/05/14/100/?nc=1 73 Johan SM6LKM
Hello Dick, I want to run something with an fixed voltage between 50 to 100 Volt, depending on what transformer configuration I'm using. The Windows program "PSU Designer II" from Duncan Amps is a ve
Alberto, Andy is right. Radio clocks keep the receiver turned off most of the time to save battery power. For example, my own alarm clock ("EuroChron") synchronises to DCF77 once per hour. The "radio
Hi, I just found that AADE's filter design software has changed from "payware" to freeware. This is a really nice tool for passive filter design. It even does crystal filters! http://www.aade.com/ 73
Hi Alberto, Jim mentioned using a DAC to interpolate between the PWM steps. The interpolation can also be done by "PWMing the PWM" between two adjacent PWM steps (sort of "controlled dithering" :-).
Hi Alberto, It rests to see if the AT90S8535 (you know that, do you ? :-) allows this "change over the nose" of the PWM limits fast enough to be effective. I can't see that as a problem. Timer1 overf
Hi David, A switching amplifier with modulated supply should also be able to do the trick. At 15 watts, a single transistor class E amplifier comes to my mind. For example, the modulation can be made
Dick, you are absolutely right that a "voltage switching" class D amplifier should not be followed by a lowpass filter with shunt C input as this will result in huge current spikes. There are two maj
Dick, just a few more comments, So it seems to me that class D and E amplifiers should preferably be followed by a low pass filter with a series inductor at the transmitter side. In the case of volta
Nathan Sokal WA1HQC has written a very good article about class E design. The article sokal.zip (zipped PDF) can be found on this page: http://mywebpages.comcast.net/tonne/classe.html Jim Tonnes cla
Dear LF enthusiasts Today, UNESCO declared the radio station SAQ in Grimeton, Sweden, as a world heritage! http://whc.unesco.org/pg.cfm?cid=31&id_site=1134 http://www.alexander.n.se/ (most info' unfo
Unfortunately your reminder was 12 hours too late. I could kick myself for forgetting it was today having heard SAQ for several years past. I'm sorry Bryan. I posted the message on July 2:nd so I bl
Hi Alberto, received your message twice... I only got it once, the delayed version. Some space-time anomaly, undoubtedly, with a warping effect... Sure. I will be very scared the day I receive a refl
Hej Bernt, I just running a test transmission on 135,995 kHz 40mW ERP. 40mW!? 599+ on a piece of wire in the shack! BHZ <-- ~80km--> LKM 73 Johan SM6LKM
For your information. 73 de Johan SM6LKM --Ursprungligt meddelande-- Från: Svensson Winnie [mailto:[email protected]] Skickat: den 7 september 2004 08:10 Till: [....] Ämne: VB: Interna
