[time-nuts] Re: 5065A - A15 (PSU)
Magnus Well I guess the humor is I also have a background in audio. Broadcasting for 20 years in the past. Various studio mixing and such. But we depart from the thread. Best regards Magnus. Paul WB8TSL On Fri, Dec 3, 2021 at 11:58 AM Magnus Danielson via time-nuts < time-nuts@lists.febo.com> wrote: > Paul, > > Mine isn't loud, but I can hear it and it annoys me. As I do not have > much other things causing noise, one becomes aware of that constant > tone. Then again, the frequency is high enough that it is relatively > easy to locate it in the room. Thing is, the ear is about most sensitive > to tones and noise at about 3 kHz, so it's not strange to become "aware" > of it. Me having a background in audio can be part of it, who knows. > > Cheers, > Magnus > > Den 2021-12-03 kl. 16:11, skrev paul swed: > > Ulf pretty funny. I knew someone had developed a replacement integrator > for > > the 5065a. It was indeed you in 2017. Small world. > > With respect to the inverter I will need to listen to my unit. I do not > > recall anything very loud. But loud is different for every person. Like > the > > idea of eliminating the -20 inverter but that really means changing A3 > and > > A7 significantly. I had not realized that the DC bias to the photocell > > actually comes from the input opamps output on A7. Something to learn > every > > day. > > Regards > > Paul > > WB8TSL > > > > On Thu, Dec 2, 2021 at 7:11 PM Shawn wrote: > > > >> Let me second Paul's question. > >> I too am interested in the purchase of 2 of these boards and am happy > >> to contribute funds in the advancement of this project. > >> Shawn > >> > >> On Thu, 2021-12-02 at 15:09 -0500, paul swed wrote: > >>> Ulf I would have replied off list. Are you intending to sell blank > >>> PCBs?I was recently thinking about the same thing as I watched the > >>> cfld move abit.I know there is also a earlier thread on this subject > >>> 3-5 years ago.RegardsPaulWB8TSL > >>> On Thu, Dec 2, 2021 at 11:15 AM Ulf Kylenfall via time-nuts < > >>> time-nuts@lists.febo.com> wrote: > Since the A15 regulator board is mentioned... > I recently decided to try to improve the Voltage Regulator board > A15inorder to use a better voltage reference than CR5 (9V) and > alsosee if Icould reduce the drift and noise of the Magnetic Field > winding.After some experimenting, I am reasonable satisfied. > The board has been completely redesigned. > The drift and noise of the +20V is reduced. Thermal driftcompared > to theoriginal design from the MagFieldcircuitry is also reduced > significally. > Modern thru-hole components are used facilitating manual assembly.A > total of 10 PCB's have been ordered (Double side, solder > masksilkscreen, plated holes etc.) but I did not opt for over- > nightdelivery, so itwill be another couple of weeks for them to > arrive.I will assemble a board for myself and, unless covid makes > itimpossible,take the 5065A to my former employer and evaluatethe > performance usingstandards available.If it performs well, the > design will be placed into "public domain".Best RegardsUlf > KylenfallSM6GXV > ___time-nuts mailing > list -- time-nuts@lists.febo.com -- To unsubscribe sendan email to > time-nuts-le...@lists.febo.com > To unsubscribe, go to and follow the instructions there. > >>> ___time-nuts mailing list > >>> -- time-nuts@lists.febo.com -- To unsubscribe send an email to > >>> time-nuts-le...@lists.febo.com > >>> To unsubscribe, go to and follow the instructions there. > >> ___ > >> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe > send > >> an email to time-nuts-le...@lists.febo.com > >> To unsubscribe, go to and follow the instructions there. > >> > > ___ > > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe > send an email to time-nuts-le...@lists.febo.com > > To unsubscribe, go to and follow the instructions there. > ___ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send > an email to time-nuts-le...@lists.febo.com > To unsubscribe, go to and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
[time-nuts] Re: 5065A - A15 (PSU)
Paul, Mine isn't loud, but I can hear it and it annoys me. As I do not have much other things causing noise, one becomes aware of that constant tone. Then again, the frequency is high enough that it is relatively easy to locate it in the room. Thing is, the ear is about most sensitive to tones and noise at about 3 kHz, so it's not strange to become "aware" of it. Me having a background in audio can be part of it, who knows. Cheers, Magnus Den 2021-12-03 kl. 16:11, skrev paul swed: Ulf pretty funny. I knew someone had developed a replacement integrator for the 5065a. It was indeed you in 2017. Small world. With respect to the inverter I will need to listen to my unit. I do not recall anything very loud. But loud is different for every person. Like the idea of eliminating the -20 inverter but that really means changing A3 and A7 significantly. I had not realized that the DC bias to the photocell actually comes from the input opamps output on A7. Something to learn every day. Regards Paul WB8TSL On Thu, Dec 2, 2021 at 7:11 PM Shawn wrote: Let me second Paul's question. I too am interested in the purchase of 2 of these boards and am happy to contribute funds in the advancement of this project. Shawn On Thu, 2021-12-02 at 15:09 -0500, paul swed wrote: Ulf I would have replied off list. Are you intending to sell blank PCBs?I was recently thinking about the same thing as I watched the cfld move abit.I know there is also a earlier thread on this subject 3-5 years ago.RegardsPaulWB8TSL On Thu, Dec 2, 2021 at 11:15 AM Ulf Kylenfall via time-nuts < time-nuts@lists.febo.com> wrote: Since the A15 regulator board is mentioned... I recently decided to try to improve the Voltage Regulator board A15inorder to use a better voltage reference than CR5 (9V) and alsosee if Icould reduce the drift and noise of the Magnetic Field winding.After some experimenting, I am reasonable satisfied. The board has been completely redesigned. The drift and noise of the +20V is reduced. Thermal driftcompared to theoriginal design from the MagFieldcircuitry is also reduced significally. Modern thru-hole components are used facilitating manual assembly.A total of 10 PCB's have been ordered (Double side, solder masksilkscreen, plated holes etc.) but I did not opt for over- nightdelivery, so itwill be another couple of weeks for them to arrive.I will assemble a board for myself and, unless covid makes itimpossible,take the 5065A to my former employer and evaluatethe performance usingstandards available.If it performs well, the design will be placed into "public domain".Best RegardsUlf KylenfallSM6GXV ___time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe sendan email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there. ___time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
[time-nuts] Re: 5065A - A15 (PSU)
Ulf pretty funny. I knew someone had developed a replacement integrator for the 5065a. It was indeed you in 2017. Small world. With respect to the inverter I will need to listen to my unit. I do not recall anything very loud. But loud is different for every person. Like the idea of eliminating the -20 inverter but that really means changing A3 and A7 significantly. I had not realized that the DC bias to the photocell actually comes from the input opamps output on A7. Something to learn every day. Regards Paul WB8TSL On Thu, Dec 2, 2021 at 7:11 PM Shawn wrote: > Let me second Paul's question. > I too am interested in the purchase of 2 of these boards and am happy > to contribute funds in the advancement of this project. > Shawn > > On Thu, 2021-12-02 at 15:09 -0500, paul swed wrote: > > Ulf I would have replied off list. Are you intending to sell blank > > PCBs?I was recently thinking about the same thing as I watched the > > cfld move abit.I know there is also a earlier thread on this subject > > 3-5 years ago.RegardsPaulWB8TSL > > On Thu, Dec 2, 2021 at 11:15 AM Ulf Kylenfall via time-nuts < > > time-nuts@lists.febo.com> wrote: > > > Since the A15 regulator board is mentioned... > > > I recently decided to try to improve the Voltage Regulator board > > > A15inorder to use a better voltage reference than CR5 (9V) and > > > alsosee if Icould reduce the drift and noise of the Magnetic Field > > > winding.After some experimenting, I am reasonable satisfied. > > > The board has been completely redesigned. > > > The drift and noise of the +20V is reduced. Thermal driftcompared > > > to theoriginal design from the MagFieldcircuitry is also reduced > > > significally. > > > Modern thru-hole components are used facilitating manual assembly.A > > > total of 10 PCB's have been ordered (Double side, solder > > > masksilkscreen, plated holes etc.) but I did not opt for over- > > > nightdelivery, so itwill be another couple of weeks for them to > > > arrive.I will assemble a board for myself and, unless covid makes > > > itimpossible,take the 5065A to my former employer and evaluatethe > > > performance usingstandards available.If it performs well, the > > > design will be placed into "public domain".Best RegardsUlf > > > KylenfallSM6GXV > > > ___time-nuts mailing > > > list -- time-nuts@lists.febo.com -- To unsubscribe sendan email to > > > time-nuts-le...@lists.febo.com > > > To unsubscribe, go to and follow the instructions there. > > ___time-nuts mailing list > > -- time-nuts@lists.febo.com -- To unsubscribe send an email to > > time-nuts-le...@lists.febo.com > > To unsubscribe, go to and follow the instructions there. > ___ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send > an email to time-nuts-le...@lists.febo.com > To unsubscribe, go to and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
[time-nuts] Re: 5065A - A15 (PSU)
Let me second Paul's question. I too am interested in the purchase of 2 of these boards and am happy to contribute funds in the advancement of this project. Shawn On Thu, 2021-12-02 at 15:09 -0500, paul swed wrote: > Ulf I would have replied off list. Are you intending to sell blank > PCBs?I was recently thinking about the same thing as I watched the > cfld move abit.I know there is also a earlier thread on this subject > 3-5 years ago.RegardsPaulWB8TSL > On Thu, Dec 2, 2021 at 11:15 AM Ulf Kylenfall via time-nuts < > time-nuts@lists.febo.com> wrote: > > Since the A15 regulator board is mentioned... > > I recently decided to try to improve the Voltage Regulator board > > A15inorder to use a better voltage reference than CR5 (9V) and > > alsosee if Icould reduce the drift and noise of the Magnetic Field > > winding.After some experimenting, I am reasonable satisfied. > > The board has been completely redesigned. > > The drift and noise of the +20V is reduced. Thermal driftcompared > > to theoriginal design from the MagFieldcircuitry is also reduced > > significally. > > Modern thru-hole components are used facilitating manual assembly.A > > total of 10 PCB's have been ordered (Double side, solder > > masksilkscreen, plated holes etc.) but I did not opt for over- > > nightdelivery, so itwill be another couple of weeks for them to > > arrive.I will assemble a board for myself and, unless covid makes > > itimpossible,take the 5065A to my former employer and evaluatethe > > performance usingstandards available.If it performs well, the > > design will be placed into "public domain".Best RegardsUlf > > KylenfallSM6GXV > > ___time-nuts mailing > > list -- time-nuts@lists.febo.com -- To unsubscribe sendan email to > > time-nuts-le...@lists.febo.com > > To unsubscribe, go to and follow the instructions there. > ___time-nuts mailing list > -- time-nuts@lists.febo.com -- To unsubscribe send an email to > time-nuts-le...@lists.febo.com > To unsubscribe, go to and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
[time-nuts] Re: 5065A - A15 (PSU)
Ulf I would have replied off list. Are you intending to sell blank PCBs? I was recently thinking about the same thing as I watched the cfld move a bit. I know there is also a earlier thread on this subject 3-5 years ago. Regards Paul WB8TSL On Thu, Dec 2, 2021 at 11:15 AM Ulf Kylenfall via time-nuts < time-nuts@lists.febo.com> wrote: > Since the A15 regulator board is mentioned... > > I recently decided to try to improve the Voltage Regulator board A15in > order to use a better voltage reference than CR5 (9V) and alsosee if I > could reduce the drift and noise of the Magnetic Field winding. > After some experimenting, I am reasonable satisfied. > > The board has been completely redesigned. > > The drift and noise of the +20V is reduced. Thermal driftcompared to the > original design from the MagField > circuitry is also reduced significally. > > Modern thru-hole components are used facilitating manual assembly. > A total of 10 PCB's have been ordered (Double side, solder masksilk > screen, plated holes etc.) but I did not opt for over-nightdelivery, so it > will be another couple of weeks for them to arrive. > I will assemble a board for myself and, unless covid makes itimpossible, > take the 5065A to my former employer and evaluatethe performance using > standards available. > If it performs well, the design will be placed into "public domain". > Best Regards > Ulf KylenfallSM6GXV > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send > an email to time-nuts-le...@lists.febo.com > To unsubscribe, go to and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
