کاربرد مدارهای برشی(Clipper circuit) (نیاز فوری)

[roya_2003]

با سلام.
خسته نباشید.
از دوستان خواهشمندم کسانی که در مورد "کاربرد مدارهای برشی(Clipper circuit) " اطلاعاتی دارند منو راهنمایی نمایند. (در صورت امکان منبعی رو معرفی نمایید) (آزمایشگاه الکترونیک)
متشکرم.

 

[masood arjomandpoor]

سلام
مدارات برشگر تو مدارات داخلي tv از قبيل قسمت همزماني پالس براي قسمت ويدئو وسيستمهاي مخابراتي براي انتقال ويا مدوله كردن بكار ميرود

 

[mm.lajvardi]

یکی از کاربردهای مدارات برش

یکی از کاربردهای مدارات برش

در IC8038 که یک مولد موج است از مدارات برش در آن برای تبدیل موج مثلثی به سینوسی استفاده شده است.

 

[elaheh_1363]

[SIZE=+1]Here are two versions of the best clipper circuit I could find in a short search of the radio handbooks I have on my, somewhat limited, book shelf. I was trying to find a fairly simple clipper circuit I could use ahead of a good audio filter to help eliminate static crashes, and the key clicks from my own QSK rigs, and to provide some of the advantages of AVC for those receivers lacking one that operates on CW. They are supposed to be very effective and are fully adjustable. One must balance three controls in order to get the best use out of these: the receiver audio gain control, the clipping level, and the clipper audio gain. Although an oscilloscope is not essential, it would make it a bit easier. First you set the clipper audio gain control at about center with clipping level at zero. Then you adjust your receiver audio gain for a comfortable level. Then adjust the clipping level on a signal you find to be at that comfortable level so that there is no apparent change in audio quality. Lastly, adjust the clipper audio gain for your chosen level. What SHOULD happen is that all signals appear to be at the same level, and there should be no apparent distortion. Either clipper has a high input impedance, 470k in the tube version, and 200 k in the SS version. Output impedance in both cases is "low", I think about 1k or less. Any clipper should be followed by a good audio filter of some sort, whether hollow or sand-state. I prefer a filter such as the MFJ or Vectronics sand-state filter because they are so small and they work like gang-busters.[/SIZE]

[SIZE=+1]This is the tube version of the Series Diode Gate Clipper. This circuit was taken in part from the "Clipper/Filter" which is shown in the 1961 ARRL Handbook, minus the filter part. Any low or medium mu triode will work well as the cathode-follower. 1/2 of a 6SL7, 12AU7, or 1G6, or a 30 works just fine. If you use a 30, you will want to use a dual-diode with a similar filament requirement and change the power-supply accordingly. Likewise for the 1G6. Click [/SIZE][SIZE=+1]here for a PDF version[/SIZE][SIZE=+1] of this circuit.[/SIZE]
[SIZE=+1]Here is the sand-state version of the clipper shown above. Click [/SIZE][SIZE=+1]here for a PDF version[/SIZE][SIZE=+1] of this circuit.[/SIZE]

[SIZE=+1]The emitter-follower is one I borrowed from Doug Demaw's Solid-State Design for the Radio Amateur. I have thoroughly tested the SS version of this clipper. I was warned by one of the members of the Glowbugs list that the two resistors associated with the diodes MUST be of different values in order to get symetrical clipping. In my testing, I found this to be most definitely true. You may want to adjust the values of those two resistors so that both positive and negative halves of the clipped waveform are as close to identical as you can make them. The values shown for the SS version are those arrived at in my testing. Your values may be different.[/SIZE]
[SIZE=+1]In addition, if you use Germanium diodes such as 1N34As, or hot-carrier diodes, your clipping waveform may be less distorted.[/SIZE]
[SIZE=+1]This circuit is actually a speech-clipper for use in an AM transmitting system. This is designed to follow the speech amp and be installed ahead of the modulator. However, it looks to me as though it would be an excellent choice for a receiver, and I intend to try it out. It is taken, with permission of the ARRL, from the ARRL Radio Amateur's Handbook , 43rd Edition, 1966, page 249.[/SIZE]
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