73's de Edd
- Aug 21, 2015
- 3,613
- Joined
- Aug 21, 2015
- Messages
- 3,613
Ah-haaaa, now we have the further needed information . . . . this is related to a photoflash unit.
With several concepts of operation faults being seen.
Typical photo-flash power supply circuits have a special main storage electrolytic that exhibits a very-very low leakage, in order to hold its voltage level up for the longest possible time.
Also the main power supply is feeding a voltage sample down to trigger on that power supply circuit automatically, if it denotes a decline of voltage level being available, below a certain specification.
That design then makes a constant voltage available to supply your photoflash tube.
Now in looking back to the right terminal board and now knowing that an SCR is being involved instead, I am still seeing a fault, in it's being able to activate a photoflash tube.
With your photo flash tube not being shown in circuit, it's looking like you are wanting to connect the far ends of the photoflash between the charged capacitor and one end of the SCR with the other end of the SCR then going to the ground and possibly your thought of using the FULL . . . UN CURRENT LIMITED . . . twelve volts of the battery going through RED / ORANGE tact switch to then activate the gate of the SCR.
Your thinking there might be that the flash will then work.
BUT look closely at the center of that flash tube and see that there is a central wire usually with a conductive paint around it, and THAT wire needs several kilovolts of temporary voltage applied to it for the internal gas fill to then ionize and THEN the tube will be able to flash through that then conductive path with that high level of stored energy being in the main capacitor.
Your present transformer that is used in the main power supply looks eerily similar to what we call a trigger transformer that is typically used to fire the flash tube but it's voltage source is a small paper capacitor that is chargeed up to the order of 200 V and then applied across the primary of that transformer with a resultant multi kilovolt coming out of the secondary of that trigger transformer to then fire the flash tube.
Maybe "they " are thinking that they can repurpose the use of one of the trigger transformers for use as a power supply transformer, but I see the need of a more robust transformer for that main storage capacitors keep alive power supply application.
Can you provide any on line reference to this " kit" so that we may then get into their minds and examine their "thinking" ?
As per your very final comment on that diode, if this is an attention getting strobe.
It could be that is a voltage sensitive semi conductor device that conducts at a certain voltage build up of the main storage capacitor threshold and then feeds down to the resistor below it and if that junction was connected to the SCR gate, it would cause the SCR to conduct.
73's de Edd
With several concepts of operation faults being seen.
Typical photo-flash power supply circuits have a special main storage electrolytic that exhibits a very-very low leakage, in order to hold its voltage level up for the longest possible time.
Also the main power supply is feeding a voltage sample down to trigger on that power supply circuit automatically, if it denotes a decline of voltage level being available, below a certain specification.
That design then makes a constant voltage available to supply your photoflash tube.
Now in looking back to the right terminal board and now knowing that an SCR is being involved instead, I am still seeing a fault, in it's being able to activate a photoflash tube.
With your photo flash tube not being shown in circuit, it's looking like you are wanting to connect the far ends of the photoflash between the charged capacitor and one end of the SCR with the other end of the SCR then going to the ground and possibly your thought of using the FULL . . . UN CURRENT LIMITED . . . twelve volts of the battery going through RED / ORANGE tact switch to then activate the gate of the SCR.
Your thinking there might be that the flash will then work.
BUT look closely at the center of that flash tube and see that there is a central wire usually with a conductive paint around it, and THAT wire needs several kilovolts of temporary voltage applied to it for the internal gas fill to then ionize and THEN the tube will be able to flash through that then conductive path with that high level of stored energy being in the main capacitor.
Your present transformer that is used in the main power supply looks eerily similar to what we call a trigger transformer that is typically used to fire the flash tube but it's voltage source is a small paper capacitor that is chargeed up to the order of 200 V and then applied across the primary of that transformer with a resultant multi kilovolt coming out of the secondary of that trigger transformer to then fire the flash tube.
Maybe "they " are thinking that they can repurpose the use of one of the trigger transformers for use as a power supply transformer, but I see the need of a more robust transformer for that main storage capacitors keep alive power supply application.
Can you provide any on line reference to this " kit" so that we may then get into their minds and examine their "thinking" ?
As per your very final comment on that diode, if this is an attention getting strobe.
It could be that is a voltage sensitive semi conductor device that conducts at a certain voltage build up of the main storage capacitor threshold and then feeds down to the resistor below it and if that junction was connected to the SCR gate, it would cause the SCR to conduct.
73's de Edd
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