2SC Datasheet PDF Download – NPN SILICON FPITAXAIL TRANSISTOR, 2SC data sheet. Description, NPN Silicon Fpitaxail Transistor. Company, ETC. Datasheet, Download 2SC datasheet. Cross ref. Similar parts: ECG23, 2SC, ECG 2SC は高周波高出力段用に設計されており, 27MHz帯の CB および 50MHz. * C – 7 BRISLIT. GEOT DAMEMO,. 短絡に対する耐破壊強度が大です。.
|Published (Last):||13 October 2013|
|PDF File Size:||11.55 Mb|
|ePub File Size:||20.36 Mb|
|Price:||Free* [*Free Regsitration Required]|
Adequate emitter bypassing was one of these.
Check for the software code that will be soon postet for details. To find out more, including how to control cookies, see here: Now, in late autoumn, this rig s nearly completely finished.
Band switch drivers The drivers for each dztasheet that drive 3 series switched relays per band are controlled by one seperate port of the controller Ports PE3 to PE7.
Wanna be LM fake power regulator Fakes like these are also easy to recognize.
So the transceiver theoretically can be operated down to 10 Volts DC without any danger that the band relays might not switch correctly. But, as I said before, all these measures cost a certain amount of gain.
First I used large capacitors in the range of 0. Due to the fact that my rig needs 3 sections of relay switched circuitry rx front end, band filter past the tx mixer and low pass filter past the exciter I switched the corresponding relays for one band in series.
So I was not keen on having more than the inevitable number of self-reception signals by adding a second interfrequency. So, a lot of 2sc137 problems ware waiting for the ambitious radio constructor.
Next get an image of an original LM on the web. Next step was to check the hFE of the transistor after having pulled it out of the rig again. I was lucky that the power supply I had built for my QRP rigs was still under test otherwise it might have damaged the rig seriously, because there were 20 Volts on the leads.
In addition, negative feedback is applied to the 3 of the 4 stages to reduce gain when the operating frequency is low:. On the left you can see 5 relay switched band pass filters.
For example computer crystals of 9, kHz, standard 9, kHz xtals or others in the same frequency region can be used. The idea behind this on one hand makes the transceiver very compact.
Emitter degeneration also helps to get gain constant AND lowers distortion: It takes only 1 or 2 minutes for example getting the transmitter board out for changing a component.
When I tested the first version of the amplifier, I was deeply disappointed. Emitter degeneration in a transistor amplifier stage The unbypassed capacitors causes a voltage drop when emitter-collector current rises. Please watch later posts on this blog that will show adaptions and modifications of this rig.
To make this fairly complex radio not too large, I found that sandwich design datazheet be the best way to save space and make the transceiver friendly for building and service. The signals were bad, distortion was a severe problem.
Next steps are an IF preamplifier which is connected to a manual gain control potentiometer sited in the front panela ladder filter with about 2. This means, datasheet get high amplification rates on 80 meters and a very much lower one on 10 meters.
The price for 6 pieces was abt. If you live in the European Union or another place in the datasheeet where there is a consumer-friendly legislation, get information what the law can do for you! If you own a spectrum analyzer you can write a simple test program to produce sine waves over the whole frequency an check the flatness of your DDS this way. Fakes like these are also easy to recognize. Optimize your rf transformers! Both the final and the driver are heatsinked and the board differs from the ones we are working off of.
But, as a passionate homebrewer, I thought to myself: Just offhand, anyone have practical experience in substituting a 2SC for a 2SC? But, no need to get desperate: That is absolutely OK for rf designs! Therefore an additional amplifier is required. At the output of the transmit mixer before first amplifier, and after the final stage where the low-pass filters for each band are selected.
Reason Report to Moderators I think this message isn’t appropriate for our Group.