Schottky diodes for RF application

Started by amal banerjee in sci.electronics.design2 years ago 3 replies

Could someone here shed some light on this ? I am experimenting with envelope detection at RF frequencies with SPICE. The mixer is a simple...

Could someone here shed some light on this ? I am experimenting with envelope detection at RF frequencies with SPICE. The mixer is a simple SPICE B signal source as B0 3 4 V(1)*V(2) where 1, 2 are the nodes at which the two signal sources are attached. THe mixer output is fed into a Schottky diode(1N5818, BAR42 etc.,) and a shunt capacitor is attached to the Schottky diode cathode. ...


Estimate of diode laser bandwidth

Started by George Herold in sci.electronics.design7 years ago 12 replies

Hi all, after tribulations with HV opamps and leaky inductors, my diode laser seems to be happy again. Here's a scan of the laser through a...

Hi all, after tribulations with HV opamps and leaky inductors, my diode laser seems to be happy again. Here's a scan of the laser through a Fabry-Perot confocal cavity. (F-P FSR ~ 380 MHz, finesse > 100.) https://www.dropbox.com/s/6zpgdfs6cqus7ig/TEK0015.BMP?dl=0 I put 10 MHz side bands on the laser to give a scale. Looking at the 'scope shot would I be safe in claiming 1 MHz (or bette


Bipolar transistor bias question

Started by billbowden in sci.electronics.design5 years ago 62 replies

I have a switching application where a single bipolar transistor might be used. The AC input is about 300mV and the transistor needs about 700...

I have a switching application where a single bipolar transistor might be used. The AC input is about 300mV and the transistor needs about 700 mV to switch on. My idea is to construct a voltage divider using a diode which will produce about a 600mV drop across the diode and a voltage divider of 2 equal resistors to set the transistor base voltage at about 300 mV so the transistor will sw...


Looking for Data on Toshiba S5977 Diode power Module 4B GTR IGBT

Started by amdx in sci.electronics.design1 year ago 3 replies

I have a few of these and don't know exactly what they are and can't find a schematic of the internals or a data sheet. I've tried about 5...

I have a few of these and don't know exactly what they are and can't find a schematic of the internals or a data sheet. I've tried about 5 different search engines and different search terms without success. Anyone with better google foo than mine? These first 5 pictures show the part. > https://duckduckgo.com/?q=Toshiba+S5977+Diode+-satellite&t=ffnt&atb=v229-2&iax=images&ia=images


Re: Automotive alternator windings & rectifier

Started by Mike Cook in sci.electronics.design8 years ago 4 replies

> > http://www.autoshop101.com/forms/alt_bwoh.pdf > > > > has photos of an alternator with 4 connections for windings (each of 3 > > ...

> > http://www.autoshop101.com/forms/alt_bwoh.pdf > > > > has photos of an alternator with 4 connections for windings (each of 3 > > phases + common), > > Not one of the pages shows four connections brought out from the > windings. Photo on p. 18. > > and the 8 diode rectifier. > > I don't see any 8 diode rectifier. Photo on p. 25. Note callouts for 6 diodes but you can see 8 round


Zener Diode Selection

Started by Anonymous in sci.electronics.design9 years ago 4 replies

Hi, DC to DC Converter:=20 http://cds.linear.com/docs/Datasheet/3970fb.pdf Zener...

Hi, DC to DC Converter:=20 http://cds.linear.com/docs/Datasheet/3970fb.pdf Zener Diode:=20 http://www.digikey.com/product-detail/en/1N5364B-TP/1N5364BTPMSCT-ND/111430= 6 The DC to DC converter can handle input voltage upto 40V. DC to DC convert= er is configured to output 5V. I do not want the input voltage to exceed 33= Volts. That is why I am using a 33V Zener. But I think that...


LT Spice diode C-V graph

Started by John Larkin in sci.electronics.design7 years ago 55 replies

What's an easy way to plot the C-V curve of a back-biased diode? Maybe a constant-current ramp, then a differentiator, and a little math...

What's an easy way to plot the C-V curve of a back-biased diode? Maybe a constant-current ramp, then a differentiator, and a little math block? Or, flip that over, constant voltage ramp and current sensor, less math. Low level AC voltage on top of a DC sweep, and some sort of AC current detector? (Fake Boonton) -- John Larkin Highland Technology, Inc jlarkin a...


faston connector spacing

Started by Winfield Hill in sci.electronics.design2 years ago 2 replies

Our RIS-796 250-amp LED current pulser has been operated up to 1100A by Rob Legg, and is well suited to make shaped current pulses up to...

Our RIS-796 250-amp LED current pulser has been operated up to 1100A by Rob Legg, and is well suited to make shaped current pulses up to 750 amps. E.g., "8.3ms single half sine-wave" for "Peak forward surge current" diode testing. Manufacturers like to make rating plots for 1 to 100 cycles, etc. For example, a SMD or SMC diode I'm considering is rated at 350A for one cycle, dr...


low-capacitance high-voltage diode

Started by Winfield Hill in sci.electronics.design5 years ago 12 replies

I'm looking for a good low-capacitance SMT 600V diode. For example, Vishay says a 1N4005 is about 5pF at 100V. ON Semi says under 3pF. ...

I'm looking for a good low-capacitance SMT 600V diode. For example, Vishay says a 1N4005 is about 5pF at 100V. ON Semi says under 3pF. Diodes, Inc says about 1.5pF. What to think? I suppose new SMTs are similar to oldies. An RGL34J MELF shows about 1.5pF. Small die is better, and I don't need a 1A rating. Why not a 50mA rating? A Vishay Ultrafast UF4005 plot says about 6pF. O...


Panasonic schottky......or not ?

Started by legg in sci.electronics.design4 years ago 19 replies

In the Panasonic schottky diode catalog, there are a number of parts that don't state that the parts are schottky, though the top of the catalog...

In the Panasonic schottky diode catalog, there are a number of parts that don't state that the parts are schottky, though the top of the catalog page still carries the schottky barrier diode heading. They share similar part numbering structures and descriptions as parts in the ultrafast rectifier line. Schottky parts are fabbed using the same 'planar' process, but the 'epitaxial' descripti...


Small Schottky diodes at very high currents

Started by Winfield Hill in sci.electronics.design2 years ago 9 replies

We're making fast 200 to 350-amp LED pulses with RIS-796 circuits (discussed here multiple times), and at switch-off the resulting inductive...

We're making fast 200 to 350-amp LED pulses with RIS-796 circuits (discussed here multiple times), and at switch-off the resulting inductive flyback could ruin the LED. We clamp the flyback current with a Schottky diode. But its 200 to 350A peak current can be far above normally accepted diode operation levels. This documents some measurements I've taken, Rob Legg is taking more....


Side bands on diode laser (unexpected wavlength shift.)

Started by George Herold in sci.electronics.design9 years ago 4 replies

So I was putting ~100MHz sidebands on a diode laser (modulating the current.) to get a frequency 'measure' of the length of a...

So I was putting ~100MHz sidebands on a diode laser (modulating the current.) to get a frequency 'measure' of the length of a (~20cm) Fabry-Perot cavity (confocal). Wavlength ~780nm, FSR ~380 MHz, a source at 190 MHz would be perfect, but I don't have anything that high. So I cranked up the power with 95 MHz and got the second order sidebands at the frequency I wanted. (RF voltage of about...


1ns max jitter oscillator, cheap - for fast 4 diode sampler

Started by Anonymous in sci.electronics.design3 years ago 118 replies

Hi I'm working on my ~3ns 4 diode sampler (preferable 1ns if possible) So I need a pretty good oscillator, with low jitter I have never...

Hi I'm working on my ~3ns 4 diode sampler (preferable 1ns if possible) So I need a pretty good oscillator, with low jitter I have never needed a good oscillator before, so on this topic I am totally at square one First I was thinking about an RC oscillator, and cleaning up the jitter. RC typically have 1us of jitter (found info on the web), and a crystal oscillator, standard t


Power supply for Buck dc-dc

Started by Anonymous in sci.electronics.design9 years ago 19 replies

Hi, Please, could I use a half-bridge diode circuit to power this buck power supply...

Hi, Please, could I use a half-bridge diode circuit to power this buck power supply ? http://www.ebay.com/itm/ZXY6005-DC-DC-60V-voltage-and-current-constant-power-supply-module-/1906 49685203?pt=LH_DefaultDomain_0&hash=item2c639b54d3 This power supply accepts 62VDC input, so if I use one rectifier diode to rectify 120Vac home's power (decay to ~ 54Vdc), it will work ? 120Vac -> 1 rectif


Finding 100A TVS diode?

Started by Spare Change in sci.electronics.design5 years ago 2 replies

BZW6-26, 26v TVS unidirectional diode, through-hole, obsolete, n/a. The original datasheet says that the 600W peak pulse power is measured over...

BZW6-26, 26v TVS unidirectional diode, through-hole, obsolete, n/a. The original datasheet says that the 600W peak pulse power is measured over 10/1000 uS waveform, but the 100A forward surge current is spec?d over 1/2 cycle of 60 Hz sine: http://diotec.com/tl_files/diotec/files/pdf/datasheets/bzw065v8 All replacements I see, the surge current is nowhere near 100A or is spec?d a


Five diodes from China for $1.60

Started by John Doe in sci.electronics.design7 years ago 20 replies

Still planning to slow down my miter saw by putting diode in series with the power cable. Five 10A10 10A 1000V diodes for $1.65 (total) shipped...

Still planning to slow down my miter saw by putting diode in series with the power cable. Five 10A10 10A 1000V diodes for $1.65 (total) shipped from China. Took a while to get here on a slow boat from China. http://www.ebay.com/itm/5pcs-Diodes-10A10-Axial-Rectifier-Diode-10-Amp-10A- 1000V-MIC-Charge-/171437814992?pt=LH_DefaultDomain_0&hash=item27ea7d74d0 You have to wonder how they can ...


USB to TP4056 charger - why is the diode there?

Started by Peabody in sci.electronics.design2 years ago 4 replies

This is the relevant part of the schematic of an 18650 battery charger and boost converter (to 5V)...

This is the relevant part of the schematic of an 18650 battery charger and boost converter (to 5V) module: https://i.postimg.cc/Tw7X35Fq/USB-to-TP4056.jpg And here's the module: https://www.aliexpress.com/item/32870411748.html Coming from the USB power pin, there's a series Schottky diode and a very low value resistor. The resistor is found in the TP4056 datasheet typical applic...


Bridge rectifier question

Started by Daku in sci.electronics.design10 years ago 11 replies

Maybe this a very stupid question. I have a SPICE model of a diode bridge. When one of the nodes is grounded, correct rectification occurs with...

Maybe this a very stupid question. I have a SPICE model of a diode bridge. When one of the nodes is grounded, correct rectification occurs with a sine input. The sine input is with reference to ground. Otherwise, if the sine input is floating, and correspondingly the diode bridge's node that was previously grounded is connected to the second node of the sine input, I get error messages. I am ...


Charge controller - power diode question

Started by Anonymous in sci.electronics.design9 years ago 15 replies

Could some power electronics guru please help ? I am trying to put together a charge controller for a battery pack/solar panel array. The...

Could some power electronics guru please help ? I am trying to put together a charge controller for a battery pack/solar panel array. The maximum solar panel output current is around 20.0A, and the maximum battery voltage is 12V. So, in the charge controller, I was planning to use the power diode 10A02, whose IFmax is 10.0A and the BV is 100.0V. To deal with the 20.0A maximum s...


back emf of relay from regulated supply

Started by Anonymous in sci.electronics.design9 years ago 5 replies

If a relay coil is powered by a regulated power supply, will the back emf g= enerated by the coil cause any damage to the regulator as cathode of...

If a relay coil is powered by a regulated power supply, will the back emf g= enerated by the coil cause any damage to the regulator as cathode of protec= tion diode is at o/p of the regulator? From what I read about driving relay= s using trnasistors the protection diode protects the transistor from the b= ack emf genereated by the relay by diverting the back emf away from the trn= sistor. No...