100 VDC from 12 VDC circuit

[indula]

Following circuit is for 300 VDC from 12 VDC. Is it possible to convert this into 100 VDC output supply ? What changes do I need to do to the schematics ?

 

[Pommie]

The simple way would be to change the transformer. However what you intend to use it for could change everything as that is a very unregulated output. Plus, that's a very old circuit.

Mike.

 

[alec_t]

+1. But is it worth modifying that circuit? For less than the cost of just a suitable transformer you could probably buy a complete off-the-shelf DC-DC boost converter with a suitable spec.

 

[Nigel Goodwin]

Plus, that's a very old circuit.

Biy of a clue when it's called a solid state 'vibrator'

 

[Pommie]

Agree with Alec, here's an example.

Mike.

 

[Pommie]

Biy of a clue when it's called a solid state 'vibrator'

Haha, missed that bit.

Mike.

 

[audioguru]

The very old circuit is probably a buzzer in addition to being a vibrator.

 

[ronsimpson]

300 VDC from 12 VDC. Is it possible to convert this into 100 VDC output

How much power? Current?
The output voltage for the circuit is a function of the transformer turn ratio.
How well do you want the output voltage regulated?

 

[AnalogKid]

Also, the schematic shows a common ground for both the input and output, but that is not a requirement; the output could be completely floating. Would a floating 100 V output be better or worse for your application? The point is that if a common ground is ok and the current is low, you might get away with a simple non-isolated boost converter.

ak

ak

 

[JimB]

that's a very old circuit.

Biy of a clue when it's called a solid state 'vibrator'

I did a bit of googling and found that the circuit was designed as a replacement for a mechanical "vibrator" as used in old valve radios when powered from 6/12v lead acid batteries.

Some amateur radio enthusiasts like to operate using original and modern recreations of a radio known as the "Paraset", so called I guess because it was used by allied agents who were parachuted in to occupied Europe during the 2nd world war.

Look here:

https://www.sm7ucz.se/a_www_paraset_co_uk/index_01.htm

And the power supply:

https://www.sm7ucz.se/a_www_paraset_co_uk/schematics_01.htm

JimB

 

[Nigel Goodwin]

I did a bit of googling and found that the circuit was designed as a replacement for a mechanical "vibrator" as used in old valve radios when powered from 6/12v lead acid batteries.

That was my point

They were used in valve car radios, they were just oscillating relays, and basically two types, sycronous (self rectifying) and non-syncronous (needed a rectifier).