Dual supply LTC4446

Started by bitrex in sci.electronics.design3 years ago 8 replies

The example circuit for the LTC4446 dual gate driver IC has the lower fet connected to ground; it seems like it should be possible to reference...

The example circuit for the LTC4446 dual gate driver IC has the lower fet connected to ground; it seems like it should be possible to reference it to a negative supply to use as e.g. class D amplifier gate driver, but it's unclear to me how to do this while keeping Vcc and the two drive control inputs ground-reference. Is that possible? Or is there another LT IC better suited for that ...


Super cryo cooler arrived today

Started by Jan Panteltje in sci.electronics.design5 years ago 31 replies

The superconductortechnologies super filter with a super conducting RF filter and

The superconductortechnologies super filter with a super conducting RF filter and


Low open loop gain from a mic preamp-why?

Started by amdx in sci.electronics.design11 months ago 36 replies

The only problem that I may have created is the transistor, I used BC547B with HFE of 200 to 450 vs BC549C with HFE of 420 to 800. All I had...

The only problem that I may have created is the transistor, I used BC547B with HFE of 200 to 450 vs BC549C with HFE of 420 to 800. All I had in my junk box. I built a low noise amplifier, original design was for a 30v supply, I chose to correct the values for a 15V supply. Designer does have a 12v version, my values are close.  I did set an emitter resistor to have equal clipping....


TO-92 vs sot-23 transistors for power

Started by Winfield Hill in sci.electronics.design7 years ago 67 replies

Q. Relative power dissipation capability of TO-92 transistor packages (viz, Zetex E-line parts) vs. sot-23 packages. More on this in my...

Q. Relative power dissipation capability of TO-92 transistor packages (viz, Zetex E-line parts) vs. sot-23 packages. More on this in my next post, first some background. One of my design interests is high-frequency, high-voltage power amplifiers. For example, I'm doing a 45V, 5A peak, DC-10MHz amplifier. My design uses 20 TO-220F power transistors, mounted on a 200W fan-cool...


Apex

Started by John Larkin in sci.electronics.design11 months ago 24 replies

Does anyone use Apex parts? https://www.mouser.com/c/semiconductors/amplifier-ics/operational-amplifiers-op-amps/?marcom=184 808364 The...

Does anyone use Apex parts? https://www.mouser.com/c/semiconductors/amplifier-ics/operational-amplifiers-op-amps/?marcom=184 808364 The companion heat sink is https://www.mouser.com/ProductDetail/Apex-Microtechnology/HS11?qs=TiOZkKH1s2RwK46pUwsmlQ%3D%3D -- If a man will begin with certainties, he shall end with doubts, but if he will be content to begin with doubts he shall end


Switched mode RF amplifiers

Started by amal banerjee in sci.electronics.design3 years ago 7 replies

Could some electronics guru here clarify this a bit ? A switched mode amplifier requires a sampling signal to accurately sample the signal to...

Could some electronics guru here clarify this a bit ? A switched mode amplifier requires a sampling signal to accurately sample the signal to be amplified. So, if the input signal has frequency of e.g., 500 MHz, the sampling frequency must be atleast 2x or 1 GHz, to curb aliasing. So, as the input signal frequency goes up, so should the sampling frequencies.


What is the most powerful vacuum tube ever made?

Started by Anonymous in sci.electronics.design4 years ago 98 replies

What is the most powerful vacuum tube ever made? I'm looking into building the most pewerful tube audio amplifier possible. I'll be using 4...

What is the most powerful vacuum tube ever made? I'm looking into building the most pewerful tube audio amplifier possible. I'll be using 4 tubes in push-pull parallel. (per channel). My goal is at least 5000 watts RMS per channel (if possible). I will likely rewind some pole pigs (power pole transformers) for output transformers, and possibly use one of them in reverse for the power supply...


Filter Cap for a battery pack ?

Started by Sid 03 in sci.electronics.design12 months ago 5 replies

I need to select a capacitor for a battery pack. I see a lot of circuits that use Alkaline batteries and then have a ceramic capacitor across the...

I need to select a capacitor for a battery pack. I see a lot of circuits that use Alkaline batteries and then have a ceramic capacitor across the leads of the series battery pack to act as a filter. My question is how do you size the cap ? I hate just looking at what someone else has done and just guess or copy. I have 4x 1.5v alkaline batteries in series powering a amplifier circuit. ...


fast, small low-capacitance zener to protect MOSFET gates

Started by Winfield Hill in sci.electronics.design4 years ago 28 replies

I became discouraged of finding a suitable low-capacitance zener to protect the MOSFET gates in my high-voltage amplifier designs. (The...

I became discouraged of finding a suitable low-capacitance zener to protect the MOSFET gates in my high-voltage amplifier designs. (The protection may be optional, but one sleeps better with it in place.) Even the 50uA-rated low-current zener diodes are in fact larger-die types, with high capacitance. For example, the 7.5-volt MMSZ4693 has about 130pF at zero volts. My solution was to us...


PWM Sine Wave Inverter output problem

Started by Myauk in sci.electronics.design11 years ago 3 replies

Dear All, I am building a PWM Sine Wave Inverter using H-Bridge IGBT Configuration. The inverter has the following stages: 1. A Sine Wave...

Dear All, I am building a PWM Sine Wave Inverter using H-Bridge IGBT Configuration. The inverter has the following stages: 1. A Sine Wave Oscillator 2. An unity gain inverting amplifier to generate inverted sine wave 3. A Triangular wave generator 4. Two Sets of Comparators to generate PWM waveform for positive and negative cycles 5. Two Half Bridge IGBT Drivers to generate A and A' s...