I need to throw together a ~150 volt supply at a few 10s of mA to test a circuit idea, but I don't have much in the way of MOSFETs in my junk box to build a switcher from. The only high-voltage device I have in stock is a couple Fairchild FQP2N60Cs, rated for 600V and 2 amps. That might be a possibility. I also have some lower voltage power devices, and I'm wondering if there would be a way to cascode two of them for a quick hack to make this work if I need to. Looks like I have some IRF530s, IRFZ24s, KSC1173 power BJT, the PNP equivalent KSA473, some MJE350s (high voltage but too low current) and whatever the NPN equivalent is. Anything I can do with this crap?
Junkbox switch for a switcher
Started by ●August 22, 2016
Reply by ●August 22, 20162016-08-22
On 08/22/2016 01:09 PM, bitrex wrote:> I need to throw together a ~150 volt supply at a few 10s of mA to test a > circuit idea, but I don't have much in the way of MOSFETs in my junk box > to build a switcher from. > > The only high-voltage device I have in stock is a couple Fairchild > FQP2N60Cs, rated for 600V and 2 amps. That might be a possibility. > > I also have some lower voltage power devices, and I'm wondering if there > would be a way to cascode two of them for a quick hack to make this work > if I need to. Looks like I have some IRF530s, IRFZ24s, KSC1173 power > BJT, the PNP equivalent KSA473, some MJE350s (high voltage but too low > current) and whatever the NPN equivalent is. > > Anything I can do with this crap?Input is going to be 12 volts, sorry.
Reply by ●August 22, 20162016-08-22
On Mon, 22 Aug 2016 13:09:32 -0400, bitrex <bitrex@de.lete.earthlink.net> wrote:>I need to throw together a ~150 volt supply at a few 10s of mA to test a >circuit idea, but I don't have much in the way of MOSFETs in my junk box >to build a switcher from. > >The only high-voltage device I have in stock is a couple Fairchild >FQP2N60Cs, rated for 600V and 2 amps. That might be a possibility. > >I also have some lower voltage power devices, and I'm wondering if there >would be a way to cascode two of them for a quick hack to make this work >if I need to. Looks like I have some IRF530s, IRFZ24s, KSC1173 power >BJT, the PNP equivalent KSA473, some MJE350s (high voltage but too low >current) and whatever the NPN equivalent is. > >Anything I can do with this crap?How about a string of 9 volt batteries? Or rectify the AC line, with some prudent protections. You could make a flyback with the big Fairchilds. You could drive it open-loop from a function generator. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Reply by ●August 22, 20162016-08-22
On 08/22/2016 02:23 PM, John Larkin wrote:> On Mon, 22 Aug 2016 13:09:32 -0400, bitrex > <bitrex@de.lete.earthlink.net> wrote: > >> I need to throw together a ~150 volt supply at a few 10s of mA to test a >> circuit idea, but I don't have much in the way of MOSFETs in my junk box >> to build a switcher from. >> >> The only high-voltage device I have in stock is a couple Fairchild >> FQP2N60Cs, rated for 600V and 2 amps. That might be a possibility. >> >> I also have some lower voltage power devices, and I'm wondering if there >> would be a way to cascode two of them for a quick hack to make this work >> if I need to. Looks like I have some IRF530s, IRFZ24s, KSC1173 power >> BJT, the PNP equivalent KSA473, some MJE350s (high voltage but too low >> current) and whatever the NPN equivalent is. >> >> Anything I can do with this crap? > > How about a string of 9 volt batteries? > > Or rectify the AC line, with some prudent protections. > > You could make a flyback with the big Fairchilds. You could drive it > open-loop from a function generator. > >Stacking 9 volts would be fun, but it's an expensive way to run a thing if you plan on doing it for any length of time. I don't know if the internal resistance of the string would let me provide say 50 mA. They used to make big 45 volt alkaline batteries; they looked like the 9V form factor but about four times longer. I had a couple maybe 15 years ago, I wonder if anyone makes those anymore. Directly rectifying the line is scary! The flyback with the Fairchild seems like a reasonable option.
Reply by ●August 22, 20162016-08-22
Den mandag den 22. august 2016 kl. 21.53.56 UTC+2 skrev bitrex:> On 08/22/2016 02:23 PM, John Larkin wrote: > > On Mon, 22 Aug 2016 13:09:32 -0400, bitrex > > <bitrex@de.lete.earthlink.net> wrote: > > > >> I need to throw together a ~150 volt supply at a few 10s of mA to test a > >> circuit idea, but I don't have much in the way of MOSFETs in my junk box > >> to build a switcher from. > >> > >> The only high-voltage device I have in stock is a couple Fairchild > >> FQP2N60Cs, rated for 600V and 2 amps. That might be a possibility. > >> > >> I also have some lower voltage power devices, and I'm wondering if there > >> would be a way to cascode two of them for a quick hack to make this work > >> if I need to. Looks like I have some IRF530s, IRFZ24s, KSC1173 power > >> BJT, the PNP equivalent KSA473, some MJE350s (high voltage but too low > >> current) and whatever the NPN equivalent is. > >> > >> Anything I can do with this crap? > > > > How about a string of 9 volt batteries? > > > > Or rectify the AC line, with some prudent protections. > > > > You could make a flyback with the big Fairchilds. You could drive it > > open-loop from a function generator. > > > > > > Stacking 9 volts would be fun, but it's an expensive way to run a thing > if you plan on doing it for any length of time. I don't know if the > internal resistance of the string would let me provide say 50 mA. > > They used to make big 45 volt alkaline batteries; they looked like the > 9V form factor but about four times longer. I had a couple maybe 15 > years ago, I wonder if anyone makes those anymore. > > Directly rectifying the line is scary! > > The flyback with the Fairchild seems like a reasonable option.http://svetelektro.com/Pictures/sil_casti/ZVS/schema.png -Lasse
Reply by ●August 22, 20162016-08-22
On Mon, 22 Aug 2016 12:58:31 -0700 (PDT), Lasse Langwadt Christensen <langwadt@fonz.dk> wrote:>Den mandag den 22. august 2016 kl. 21.53.56 UTC+2 skrev bitrex: >> On 08/22/2016 02:23 PM, John Larkin wrote: >> > On Mon, 22 Aug 2016 13:09:32 -0400, bitrex >> > <bitrex@de.lete.earthlink.net> wrote: >> > >> >> I need to throw together a ~150 volt supply at a few 10s of mA to test a >> >> circuit idea, but I don't have much in the way of MOSFETs in my junk box >> >> to build a switcher from. >> >> >> >> The only high-voltage device I have in stock is a couple Fairchild >> >> FQP2N60Cs, rated for 600V and 2 amps. That might be a possibility. >> >> >> >> I also have some lower voltage power devices, and I'm wondering if there >> >> would be a way to cascode two of them for a quick hack to make this work >> >> if I need to. Looks like I have some IRF530s, IRFZ24s, KSC1173 power >> >> BJT, the PNP equivalent KSA473, some MJE350s (high voltage but too low >> >> current) and whatever the NPN equivalent is. >> >> >> >> Anything I can do with this crap? >> > >> > How about a string of 9 volt batteries? >> > >> > Or rectify the AC line, with some prudent protections. >> > >> > You could make a flyback with the big Fairchilds. You could drive it >> > open-loop from a function generator. >> > >> > >> >> Stacking 9 volts would be fun, but it's an expensive way to run a thing >> if you plan on doing it for any length of time. I don't know if the >> internal resistance of the string would let me provide say 50 mA. >> >> They used to make big 45 volt alkaline batteries; they looked like the >> 9V form factor but about four times longer. I had a couple maybe 15 >> years ago, I wonder if anyone makes those anymore. >> >> Directly rectifying the line is scary! >> >> The flyback with the Fairchild seems like a reasonable option. > >http://svetelektro.com/Pictures/sil_casti/ZVS/schema.png > >-LasseThat's not a flyback; it's a "fryback", a mosfet roaster. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Reply by ●August 22, 20162016-08-22
On Mon, 22 Aug 2016 15:53:51 -0400 bitrex <bitrex@de.lete.earthlink.net> wrote in Message id: <jLIuz.2$j44.0@fx24.iad>:>They used to make big 45 volt alkaline batteries; they looked like the >9V form factor but about four times longer. I had a couple maybe 15 >years ago, I wonder if anyone makes those anymore.Sure. Google be yer friend, eh? http://www.batteryjunction.com/exell-415a.html?gclid=CjwKEAjwxeq9BRDDh4_MheOnvAESJABZ4VTqMVOs3gSgtJ4H1T0agjdL8vqD5Y73JmOD6Kqp1PgeShoCOGDw_wcB http://www.batteryjunction.com/exell-455.html?gclid=CjwKEAjwxeq9BRDDh4_MheOnvAESJABZ4VTqVmk5JkCIFoPPvLaW2kCDma8e-HT2qEvbEV0s74amERoCrtfw_wcB
Reply by ●August 22, 20162016-08-22
On Mon, 22 Aug 2016 16:21:33 -0400, JW <none@dev.null> wrote:>On Mon, 22 Aug 2016 15:53:51 -0400 bitrex <bitrex@de.lete.earthlink.net> >wrote in Message id: <jLIuz.2$j44.0@fx24.iad>: > >>They used to make big 45 volt alkaline batteries; they looked like the >>9V form factor but about four times longer. I had a couple maybe 15 >>years ago, I wonder if anyone makes those anymore. > >Sure. Google be yer friend, eh? > >http://www.batteryjunction.com/exell-415a.html?gclid=CjwKEAjwxeq9BRDDh4_MheOnvAESJABZ4VTqMVOs3gSgtJ4H1T0agjdL8vqD5Y73JmOD6Kqp1PgeShoCOGDw_wcB > >http://www.batteryjunction.com/exell-455.html?gclid=CjwKEAjwxeq9BRDDh4_MheOnvAESJABZ4VTqVmk5JkCIFoPPvLaW2kCDma8e-HT2qEvbEV0s74amERoCrtfw_wcBThere used to be 90V "B" batteries for "portable" radios... I can still find mention on the web but none of the links seem to work. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I'm looking for work... see my website.
Reply by ●August 22, 20162016-08-22
On Mon, 22 Aug 2016 13:29:45 -0700 Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote in Message id: <jtnmrb1k0o7ea51b0ionufhgoeqnd8cv3t@4ax.com>:>On Mon, 22 Aug 2016 16:21:33 -0400, JW <none@dev.null> wrote: > >>On Mon, 22 Aug 2016 15:53:51 -0400 bitrex <bitrex@de.lete.earthlink.net> >>wrote in Message id: <jLIuz.2$j44.0@fx24.iad>: >> >>>They used to make big 45 volt alkaline batteries; they looked like the >>>9V form factor but about four times longer. I had a couple maybe 15 >>>years ago, I wonder if anyone makes those anymore. >> >>Sure. Google be yer friend, eh? >> >>http://www.batteryjunction.com/exell-415a.html?gclid=CjwKEAjwxeq9BRDDh4_MheOnvAESJABZ4VTqMVOs3gSgtJ4H1T0agjdL8vqD5Y73JmOD6Kqp1PgeShoCOGDw_wcB >> >>http://www.batteryjunction.com/exell-455.html?gclid=CjwKEAjwxeq9BRDDh4_MheOnvAESJABZ4VTqVmk5JkCIFoPPvLaW2kCDma8e-HT2qEvbEV0s74amERoCrtfw_wcB > >There used to be 90V "B" batteries for "portable" radios... I can >still find mention on the web but none of the links seem to work.I remember those, for old tube radios. There doesn't seem to be any available anywhere. Here's some oddballs: http://www.batteryjunction.com/exell-493.html http://www.batteryjunction.com/exell-489a.html Wouldn't test those with my tongue!
Reply by ●August 22, 20162016-08-22
On Mon, 22 Aug 2016 16:42:39 -0400, JW <none@dev.null> wrote:>On Mon, 22 Aug 2016 13:29:45 -0700 Jim Thompson ><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote in Message id: ><jtnmrb1k0o7ea51b0ionufhgoeqnd8cv3t@4ax.com>: > >>On Mon, 22 Aug 2016 16:21:33 -0400, JW <none@dev.null> wrote: >> >>>On Mon, 22 Aug 2016 15:53:51 -0400 bitrex <bitrex@de.lete.earthlink.net> >>>wrote in Message id: <jLIuz.2$j44.0@fx24.iad>: >>> >>>>They used to make big 45 volt alkaline batteries; they looked like the >>>>9V form factor but about four times longer. I had a couple maybe 15 >>>>years ago, I wonder if anyone makes those anymore. >>> >>>Sure. Google be yer friend, eh? >>> >>>http://www.batteryjunction.com/exell-415a.html?gclid=CjwKEAjwxeq9BRDDh4_MheOnvAESJABZ4VTqMVOs3gSgtJ4H1T0agjdL8vqD5Y73JmOD6Kqp1PgeShoCOGDw_wcB >>> >>>http://www.batteryjunction.com/exell-455.html?gclid=CjwKEAjwxeq9BRDDh4_MheOnvAESJABZ4VTqVmk5JkCIFoPPvLaW2kCDma8e-HT2qEvbEV0s74amERoCrtfw_wcB >> >>There used to be 90V "B" batteries for "portable" radios... I can >>still find mention on the web but none of the links seem to work. > >I remember those, for old tube radios. There doesn't seem to be any >available anywhere.45V batteries are readily available. <https://www.amazon.com/Exell-Battery-455-45-Volt-Alkaline/dp/B00IDXP26S/ref=sr_1_1?s=electronics&ie=UTF8&qid=1471914583&sr=1-1&keywords=45v+battery>
