Biassing - All About Circuits
2020年5月18日 · A theoretical question: are there any devices out there, which don't need biassing, to handle inputs above and below zero? If not, why not? Why didn't the designer of the universe, with all its complex structures and laws, provide some way that an amplification device would just sit at a half-on half-off point on its operating curves?
f to v converter using LM331 - All About Circuits
2024年7月29日 · Dear All, I too tried the same circuit, except for c2 being 1uF / 63v electrolytic cap. On assembling I am getting almost full dc power supply voltage at the output. I changed two ic's , with same result. So I tried simulating the circuit on proteus. Here the output is zero v. I …
Vbe multiplier output stage design troubleshooting.
2024年5月20日 · R5 should ideally be a constant current source. The Vbe multiplier works best if the current through it is kept reasonably constant. I would suggest that R3 and R4 should be at least 20 times larger, so that the majority of the current in the driver stage goes through the Vbe multiplier transistor, not through its biassing resistors.
Compare 1Gbps Ethernet connector internal magnetics/schematics
2021年6月21日 · That said, they aren't interchangeable as the Wurth has centre-taps on the PCB side connected to pins 5/6 whereas the Molex have that as 1 & 2 and separated for VCC & GND and DC-biassing. Other than that they are electrically/RF-wise very similar. The Wurth is more marginally detailed spec.
current not alternating in zvs simulation after coupling primary to ...
2021年5月13日 · The biassing was incorrect because of voltage source 2. If the above is correct, could you explain how voltage source 2 affected the biassing, and what "o/c" means? Like Reply
Cascaded BJT RF Amplifier | All About Circuits
2024年1月13日 · Hello, I'm working on a hobby project to design a 10MHz-1GHz bandwidth amplifier with 200x voltage gain (typical input is -12.5mV pulse with 500ps rise time). My design intent is to cascade the BFR193 (maybe 4 stages) to achieve the gain and bandwidth I desire. Any suggestions on where to find...
quick high level audio amplifier question | All About Circuits
2020年12月12日 · Yes, but generally output stages are common-collector because biassing is easier. A push-pull common emitter stage is difficult to bias. Common emitter is no less or more efficient than common-collector
BJT voltage divider biasing - All About Circuits
2020年7月31日 · After revising the procedure to calculate values for voltage divider biasing of a BJT amplifier, I couldn't find a concrete indication of how to decide on the collector current. The "too much" limit is obvious, but, what about the other extreme of a reasonable minimum? My question: how to...
PT2399 audio processing chip for electric guitar pedal
2021年4月13日 · View attachment 235311R5 and L1 are the pickup resistance and inductance C2 is the cable capacitance The op-amp is part of the PT2399 so the rest of the biassing is not shown.
Mosfet gate voltage clamp... need advice! | All About Circuits
2009年10月18日 · I built an H-bridge using P-channel mosfets for the high-side switches. The mosfet's maximum gate-to-source voltage is +/-25vdc.... My design uses pull-up resistors to pull the gate voltage up to the source voltage to turn them off. This works fine at 12v and 18v.... But if I use a +24v power...