It is not my work ( only schematic ), but one my fiend's. CN 1,2 are mains input, CN 3-6 are outputs for two transformers. 😉
Re: Re: Unhappy Diode
No, as you pointed out, they are rated for 150A peak repetitive surge current (not 300A) -- the problem is cycling the power supply rapidly -- note in the picture that I am not using a torroid -- but a laminated core -- the secondary inductance is ~ 34uH compared to the torroid (120uH) I had used in the prior supply V = L * (di/dt) -- therein lies the problem (I think).
This is the biggest "non-ham radio" supply I have ever worked on so I would like it to run reliably.
note -- when measuring secondary inductance remember to short the primary winding.
peranders said:
No, as you pointed out, they are rated for 150A peak repetitive surge current (not 300A) -- the problem is cycling the power supply rapidly -- note in the picture that I am not using a torroid -- but a laminated core -- the secondary inductance is ~ 34uH compared to the torroid (120uH) I had used in the prior supply V = L * (di/dt) -- therein lies the problem (I think).
This is the biggest "non-ham radio" supply I have ever worked on so I would like it to run reliably.
note -- when measuring secondary inductance remember to short the primary winding.
schematic of 4020...
All the features designed with so many components around the 4020 could be made using 4541 with few passives and a relay driver Xtor since it has a power-on auto reset.
Gajanan Phadte
All the features designed with so many components around the 4020 could be made using 4541 with few passives and a relay driver Xtor since it has a power-on auto reset.
Gajanan Phadte
4541 is very common in time relays, good IC also. 555 is OK and surely a small AVRTiny microcontroller. You have many options in order to create a time delay. I chosed the simpliest possible, plain transistors, resitors and caps.
To gmphadte : My idea was to use as clock mains frequency, 'cos I need in every amps independent ( but the same ) delay in both channels ( I'm using this circuit also for delayed output of amp - Q 12). Sure, in inrush using you can also use 4541 😎 .
The 4541 is probably even easier to use since it has a monostable operation built-in and you can also clock this circuit from an external source.
I'm not sure but I think Lars Clausen also uses 4541 in his softsarter.
I'm not sure but I think Lars Clausen also uses 4541 in his softsarter.
That's fine.
U can use the mains freq as the clock, thus synchronizing the multiple timers, in multichannel syatems with less components using 4541
DIYers, if u are thinking of designing a delay, please note.
Gajanan Phadte
U can use the mains freq as the clock, thus synchronizing the multiple timers, in multichannel syatems with less components using 4541
DIYers, if u are thinking of designing a delay, please note.
Gajanan Phadte
Don't forget that this "task" isn't to design a device with as few parts as possible. It's about making a good, safe and reliable design.
4541 used will
1) not need T2 and associated circuitry since it has power-on reset
2) not need T3 and associated circuitry since biasing mode pin to LOW will enable single cycle mode
Use of small filter cap after rectifier will reset the circuit quick enough.
Mains frequency shaper will only be necessary.
Gajanan Phadte
1) not need T2 and associated circuitry since it has power-on reset
2) not need T3 and associated circuitry since biasing mode pin to LOW will enable single cycle mode
Use of small filter cap after rectifier will reset the circuit quick enough.
Mains frequency shaper will only be necessary.
Gajanan Phadte
This can be accomplished by only a 1-10 Mohms resistor directly to AC, even 230 VAC! Philips HEF series may not work properly if you don't limit the voltage but plain CMOS will work.gmphadte said:
I gave the mains frequency shaper the benefit of doubt, as some purist might find that we are biasing a CMOS input before the VDD is established.
Thanks
Gajanan Phadte
OK guys 😎 , man is sometimes little bit conservative. Take it only as one of many examples, how to do it. I'm using it since year 89', it work quite satisfactory for my necessity and price of devices is funny ( I think, that in 89' was not 4541 on market ) 😎 .
Upupa Epops, the idea is to give a better and tight solution for the readers.
Enjoy
Gajanan Phadte
What do you mean by " tight solution " 😉 ? I need shorter delay ( inrush circuit ) and longer delay ( output relay ), nothing more. Both function I can do it with this circuit. 😎
4541 has been around since at least 1985..... I think we started to use this IC at work at that time.Upupa Epops said:
The clock inhibit function executed using T3...
This transistor collector is biased/clamped at 0.6 volt peak ripple i.e. the base emitter junction forward voltage of T1. The negative side ripple peak is the forward voltage drop of D7.
If needed to implement such clock inhibit function, a 2input gate is prefered with slight changes. In this case, one with schmitt i/p type is prefered if T1 is also to be eliminated.
This transistor collector is biased/clamped at 0.6 volt peak ripple i.e. the base emitter junction forward voltage of T1. The negative side ripple peak is the forward voltage drop of D7.
If needed to implement such clock inhibit function, a 2input gate is prefered with slight changes. In this case, one with schmitt i/p type is prefered if T1 is also to be eliminated.
STIL04-P5 from ST Micro --
I got some of these in from Digikey on Friday -- ST now has a much better PDF describing the product on their site -- the device uses the auxiliary power feed to control the two forward diodes of a bridge -- the regular bridge diode feed the filter cap through a current limiting resistor.
There is now an 8 amp version available, the STIL08-P5.
I got some of these in from Digikey on Friday -- ST now has a much better PDF describing the product on their site -- the device uses the auxiliary power feed to control the two forward diodes of a bridge -- the regular bridge diode feed the filter cap through a current limiting resistor.
There is now an 8 amp version available, the STIL08-P5.
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