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Hi, I checked the backup library (I use LtSpice 17) but actually that JFet doesn't exist Maybe it's a custom library I added a while ago. It could be the 2SK242. The related .model file is:
.model J2sk242 NJF(Beta=3.326m Rs=5.875 Rd=5.875 Betatce=-.5 Lambda=1.429u Vto=-1.514 Vtotc=-2.5m...
Good evening, I am looking for information on the JFET J2SK242 but I find very little about it. This Fet is in the LtSpice database. Does it have an equivalent?
Thank you
Hi,
I suspect that a THS4001 was used only because it was much cheaper but in fact defrauding the sale. However, I will send it back and report it to the sales platform. Then knowing whether to use a real OPA657 instead of the THS4001 would get a higher gain with less noise. I need it as a...
Hi everyone, I bought an amplifier module. On the product page it was declared that it mounted an OPA657 but verifying upon arrival there is mounted a THS4001. I don't have much experience with these two opamps but comparing the datasheets, despite being electrically replaceable The OPA657 is...
Can i use a programmable attenuator instead fixed ones? If precise i can select the attenuation more precise. What do you think?
https://www.aliexpress.com/item/1005002013465365.html
https://www.aliexpress.com/item/1005002352200213.html
https://www.aliexpress.com/item/1005002266924680.html...
Yes he have sma connector and is declared to 50 Ohm, load.Unfortunately my Signal generator cannot produce voltage under 10mV but o can reduce this with a voltage divider right?. I will try some measure using voltage divider or other.
Signal input to amp is sine 10mv and frequencies form 1 to 50Mhz . No problem of wave distortion with the scope directly connected on the outoput. The problem comes when i use a 50ohm dummy load but why?
The impedance on scope is not tunable andin this case is fixed to 1MΩ±2%, in parallel with 10pF±5pF . Here below the schematic used for measures. In simple i've made a dummy load as drawed and connected the probe on dummy load in that way.
Hi!,
these days i am testing some RF amplifiers with a signal generator and one of these is the one in the picture but i have a problem. When I connect the output of this amp to the oscilloscope I see the sine wave correctly amplified and not distorted. Now this amplifier should have been made...
Hi,
i'm searching for spice model or data for Jfet vcr7n . Any suggestion where find it? On the interfet site I can not find them.
https://www.interfet.com/jfet-datasheets/jfet-vcr7n-interfet.r00.pdf
Thanks
Thank you all for the questions. @dick_freebird . I checked and I believe you are right. Low values are on high frequency and low power FETs. Basically I have a circuit where the first stage I have to use a jfet to give the characteristics of these components. Initially I went on a MPF102 but it...
I'm looking for equivalents for 2sc1162 and 2sa715 Hitachi. These transistors are excellent, but it is becoming difficult to find them. I found some other models, but they have much lower ft. Do you have any ideas? Thank you.
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