Would any kind souls happen to have a circuit diagram for a Motorola
variable PSU Mod. number S-1347D?
On 02/04/2023 12:25, Les. Hayward wrote:
Would any kind souls happen to have a circuit diagram for a Motorola
variable PSU Mod. number S-1347D?
http://motorola.justanswer.co.uk/ ?
On 04/04/2023 09:51, RustyHinge wrote:
On 02/04/2023 12:25, Les. Hayward wrote:Thanks. Paid a quid and tried it. Waste of a quid, but worth a shot.
Would any kind souls happen to have a circuit diagram for a Motorola variable PSU Mod. number S-1347D?
http://motorola.justanswer.co.uk/ ?
On 4/5/2023 5:02 AM, Les. Hayward wrote:Thanks. There is one of those controllers in there and I have studied
On 04/04/2023 09:51, RustyHinge wrote:
On 02/04/2023 12:25, Les. Hayward wrote:Thanks. Paid a quid and tried it. Waste of a quid, but worth a shot.
Would any kind souls happen to have a circuit diagram for a Motorola
variable PSU Mod. number S-1347D?
http://motorola.justanswer.co.uk/ ?
The controller board:
https://i.redd.it/v3655qp6cy881.jpg
See if one of these is on the controller board.
https://datasheetspdf.com/pdf/791050/Motorola/MC1566L/1
"Datasheet Download MC1566L Datasheet"
The puzzle would be, why are there seven trimmers on the controller board ?
There could be two output windings on the transformer. One
winding is for the supervisor voltage (the DC to run the 1566).
Since the controller can series-pass much higher voltages,
a second winding provides the power source for the output.
In the diagram with the back to back diodes, those diodes protect
a back to back pair inside the chip. That's what some of the other
diodes do as well. My only concern with this, is whether any of the
diodes are being operated outside their current flow limits. Apparently
one diode on that controller board, likes to burn. All the diodes
are similar to 1N4007 series diodes, 1 ampere, and the characteristic
is similar to what is inside the chip. The fourth page of the PDF,
has all of the "theoretical" diodes shown (diodes for protection purposes, diodes for stuff like capacitor discharge paths during a dead short).
In the same way a 7805 has a theoretical diode you can place outside
the device, which runs in parallel with a parasitic substrate diode.
Paul
On 05/04/2023 19:50, Paul wrote:1N5408 - but is it a big zener?
On 4/5/2023 5:02 AM, Les. Hayward wrote:Thanks. There is one of those controllers in there and I have studied the application notes in the hope of seeing a correlation. The circuitry in the PSU does not seem to follow the examples closely enough.
On 04/04/2023 09:51, RustyHinge wrote:
On 02/04/2023 12:25, Les. Hayward wrote:Thanks. Paid a quid and tried it. Waste of a quid, but worth a shot.
Would any kind souls happen to have a circuit diagram for a Motorola variable PSU Mod. number S-1347D?
http://motorola.justanswer.co.uk/ ?
The controller board:
https://i.redd.it/v3655qp6cy881.jpg
See if one of these is on the controller board.
https://datasheetspdf.com/pdf/791050/Motorola/MC1566L/1
"Datasheet Download MC1566L Datasheet"
The puzzle would be, why are there seven trimmers on the controller board ? >>
There could be two output windings on the transformer. One
winding is for the supervisor voltage (the DC to run the 1566).
Since the controller can series-pass much higher voltages,
a second winding provides the power source for the output.
In the diagram with the back to back diodes, those diodes protect
a back to back pair inside the chip. That's what some of the other
diodes do as well. My only concern with this, is whether any of the
diodes are being operated outside their current flow limits. Apparently
one diode on that controller board, likes to burn. All the diodes
are similar to 1N4007 series diodes, 1 ampere, and the characteristic
is similar to what is inside the chip. The fourth page of the PDF,
has all of the "theoretical" diodes shown (diodes for protection purposes, >> diodes for stuff like capacitor discharge paths during a dead short).
In the same way a 7805 has a theoretical diode you can place outside
the device, which runs in parallel with a parasitic substrate diode.
Paul
The item I am trying to repair does have the burnt diode as shown in your piccie. What confuses me is that the item which looks like a large yellow ?diode? at the bottom left of the pcb is also fried. It is black in my example and about the size of a
The owner confessed to me that he was trying to charge a car battery with the PSU (with no limiting resistor) so anything could have happened...
There are two windings on the transformer as you suggest and I am trying to trace the circuit out, but it is quite a job to do so! My biggest problem is trying to establish the value and purpose of that big diode.
Les.
Check and see if the TO-220 style device that burned, wasNo, all of the transistors are fine. What I really need is the spec. for
a transistor with three legs. I have some surplus parts,
that somehow I identified or made a tentative identification.
Things like 2N6109, TIP35, and 2N5296. What is interesting
about them, is the novel mechanical features. On one of them,
the tab (and probably the central pin) seem to be made of
ordinary tin plate metal. The others look more like proper
transistor packages and not quite as cheesy.
[Picture]
https://i.postimg.cc/ZqywxcFP/tabbed-transistors.jpg
Paul
On 07/04/2023 10:59, Paul wrote:
No, all of the transistors are fine. What I really need is the spec. for the diode at the bottom left of your earlier picture. I suspect that as one of the diodes across part of the IC is knackered, that a replacement IC will also be required.
Check and see if the TO-220 style device that burned, was
a transistor with three legs. I have some surplus parts,
that somehow I identified or made a tentative identification.
Things like 2N6109, TIP35, and 2N5296. What is interesting
about them, is the novel mechanical features. On one of them,
the tab (and probably the central pin) seem to be made of
ordinary tin plate metal. The others look more like proper
transistor packages and not quite as cheesy.
[Picture]
https://i.postimg.cc/ZqywxcFP/tabbed-transistors.jpg
Paul
On 04/04/2023 09:51, RustyHinge wrote:
On 02/04/2023 12:25, Les. Hayward wrote:Thanks. Paid a quid and tried it. Waste of a quid, but worth a shot.
Would any kind souls happen to have a circuit diagram for a Motorola
variable PSU Mod. number S-1347D?
http://motorola.justanswer.co.uk/ ?
On 05/04/2023 10:02, Les. Hayward wrote:
On 04/04/2023 09:51, RustyHinge wrote:
On 02/04/2023 12:25, Les. Hayward wrote:Thanks. Paid a quid and tried it. Waste of a quid, but worth a shot.
Would any kind souls happen to have a circuit diagram for a Motorola
variable PSU Mod. number S-1347D?
http://motorola.justanswer.co.uk/ ?
Having just seen my credit card statement, I note that these pirates
have deducted an unauthorised £35.00 in addition to the £1 for the enquiry.
I strongly advise AGAINST anyone using this "service"!
Les.
On 05/04/2023 10:02, Les. Hayward wrote:
On 04/04/2023 09:51, RustyHinge wrote:
On 02/04/2023 12:25, Les. Hayward wrote:Thanks. Paid a quid and tried it. Waste of a quid, but worth a shot.
Would any kind souls happen to have a circuit diagram for a Motorola
variable PSU Mod. number S-1347D?
http://motorola.justanswer.co.uk/ ?
Having just seen my credit card statement, I note that these piratesLooks like you have paid for one month's worth of Technician answers.
have deducted an unauthorised £35.00 in addition to the £1 for the enquiry.
I strongly advise AGAINST anyone using this "service"!
Les.
On 15/04/2023 21:36, Les. Hayward wrote:Silly me - replied to sender instead of follow -up. Try again:
On 05/04/2023 10:02, Les. Hayward wrote:
On 04/04/2023 09:51, RustyHinge wrote:
On 02/04/2023 12:25, Les. Hayward wrote:Thanks. Paid a quid and tried it. Waste of a quid, but worth a shot.
Would any kind souls happen to have a circuit diagram for a
Motorola variable PSU Mod. number S-1347D?
http://motorola.justanswer.co.uk/ ?
Having just seen my credit card statement, I note that these pirates
have deducted an unauthorised £35.00 in addition to the £1 for the
enquiry.
I strongly advise AGAINST anyone using this "service"!
Les.
Beware; looking at their website they will charge you a monthly fee
unless you cancel.
Jeff
On 15/04/2023 21:36, Les. Hayward wrote:
On 05/04/2023 10:02, Les. Hayward wrote:
On 04/04/2023 09:51, RustyHinge wrote:
On 02/04/2023 12:25, Les. Hayward wrote:Thanks. Paid a quid and tried it. Waste of a quid, but worth a shot.
Would any kind souls happen to have a circuit diagram for a Motorola >>>>> variable PSU Mod. number S-1347D?
http://motorola.justanswer.co.uk/ ?
Having just seen my credit card statement, I note that these pirates
have deducted an unauthorised £35.00 in addition to the £1 for the enquiry.
I strongly advise AGAINST anyone using this "service"!
Beware; looking at their website they will charge you a monthly fee
unless you cancel.
Have informed card company to block any further payments...
Beware; looking at their website they will charge you a monthly feeA sophisticated fraud, but a fraud nonetheless. So why
unless you cancel.
aren't these people in prison?
On 16/04/2023 12:48, Les. Hayward wrote:
Have informed card company to block any further payments...
You should also cancel with the people who you now have a subscription with.
For reference:
https://www.citizensadvice.org.uk/debt-and-money/banking/stopping-a-future-payment-on-your-debit-or-credit-card/
On 17 Apr 2023 at 08:04:59 BST, "mm0fmf" <none@invalid.com> wrote:
On 16/04/2023 12:48, Les. Hayward wrote:
Have informed card company to block any further payments...
You should also cancel with the people who you now have a subscription with. >>
For reference:
https://www.citizensadvice.org.uk/debt-and-money/banking/stopping-a-future-payment-on-your-debit-or-credit-card/
Yes, the credit card companies don't do the same guarantee to allow you to cancel as the banks do with direct debit. They argue, with some logic, that it
is not their job to help you break a contract. So if the people charging you act illegally your only remedy is to either go to court or raise a formal dispute with the credit card company and present evidence to them. They make too much money out of people inertia selling subscriptions to make it too easy
to get out of it.
On 17/04/2023 18:30, Roger Hayter wrote:
On 17 Apr 2023 at 08:04:59 BST, "mm0fmf" <none@invalid.com> wrote:looked perfectly leglit to me....fully spelt out
On 16/04/2023 12:48, Les. Hayward wrote:
Have informed card company to block any further payments...
You should also cancel with the people who you now have a subscription with.
For reference:
https://www.citizensadvice.org.uk/debt-and-money/banking/stopping-a-future-payment-on-your-debit-or-credit-card/
Yes, the credit card companies don't do the same guarantee to allow you to >> cancel as the banks do with direct debit. They argue, with some logic, that it
is not their job to help you break a contract. So if the people charging you >> act illegally your only remedy is to either go to court or raise a formal
dispute with the credit card company and present evidence to them. They make >> too much money out of people inertia selling subscriptions to make it too easy
to get out of it.
On 17/04/2023 18:30, Roger Hayter wrote:I have no problem with credit cards - they tend to be as helpful as
On 17 Apr 2023 at 08:04:59 BST, "mm0fmf" <none@invalid.com> wrote:looked perfectly leglit to me....fully spelt out
On 16/04/2023 12:48, Les. Hayward wrote:
Have informed card company to block any further payments...
You should also cancel with the people who you now have a
subscription with.
For reference:
https://www.citizensadvice.org.uk/debt-and-money/banking/stopping-a-future-payment-on-your-debit-or-credit-card/
Yes, the credit card companies don't do the same guarantee to allow
you to
cancel as the banks do with direct debit. They argue, with some logic,
that it
is not their job to help you break a contract. So if the people
charging you
act illegally your only remedy is to either go to court or raise a formal
dispute with the credit card company and present evidence to them.
They make
too much money out of people inertia selling subscriptions to make it
too easy
to get out of it.
What I object to is the very sharp practice of withdrawing the full
amount almost immediately the "trial" period starts.
My bank used to offer single-use credit cards. i.e. you got a credit
card number and CVV2 and a short expiry date through your online account page. You could use the card for a single purchase and was ideal for
online use. After it had been used once, no more transactions would be
paid. Sadly they stopped doing them some time back.
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