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By: John Gord <johngord@...>

Description:
Radio Shack Realistic PRO-30 Scanner Schematics
 

Hi John,
?
Do you have the components listing, my inductor L201 is damaged and I need to know the measurement in henry's or Henries please if you have that information.
?
Thank ing you in advance
?
73's
?
Ray
 

Ray,
L201 in the Realistic PRO-30 is just listed as "Coil, DC/DC Convertor".? The Radio Shack part number is CA-8694 and the MFR's part number is 6PNO-196.? Not too helpful.
--John
?
On Sun, Aug 11, 2024 at 05:34 AM, @austo63 wrote:

Hi John,
?
Do you have the components listing, my inductor L201 is damaged and I need to know the measurement in henry's or Henries please if you have that information.
?
Thank ing you in advance
?
73's
?
Ray
 

Ray,
The PRO-30 schematic shows a tapped winding with 3 leads.? The TCA720 looks to be a boost converter designed to put out about 33V from a 4.5-18V supply.? For this application, they want a lower voltage, so they used a tapped inductor get about 25V at the tap while the chip sees more like 33V across the full winding.? The data sheet shows 5 millihenry for the example inductor value.
--John
?
On Sun, Aug 11, 2024 at 05:34 AM, @austo63 wrote:

Hi John,
?
Do you have the components listing, my inductor L201 is damaged and I need to know the measurement in henry's or Henries please if you have that information.
?
Thank ing you in advance
?
73's
?
Ray
 

Is it a single winding, tapped or more than one winding?

Neil


On Sun., Aug. 11, 2024, 11:04 a.m. John Gord via , <johngord=[email protected]> wrote:
Ray,
L201 in the Realistic PRO-30 is just listed as "Coil, DC/DC Convertor".? The Radio Shack part number is CA-8694 and the MFR's part number is 6PNO-196.? Not too helpful.
--John
?
 

It'll be no fun figuring that out without a good working example. Otherwise I suspect you'd have to reverse engineer it.

Ouch!

Neil.

On Sun., Aug. 11, 2024, 3:28 p.m. John Gord via , <johngord=[email protected]> wrote:
Ray,
The PRO-30 schematic shows a tapped winding with 3 leads.? The TCA720 looks to be a boost converter designed to put out about 33V from a 4.5-18V supply.? For this application, they want a lower voltage, so they used a tapped inductor get about 25V at the tap while the chip sees more like 33V across the full winding.? The data sheet shows 5 millihenry for the example inductor value.
--John
?
On Sun, Aug 11, 2024 at 05:34 AM, @austo63 wrote:
Hi John,
?
Do you have the components listing, my inductor L201 is damaged and I need to know the measurement in henry's or Henries please if you have that information.
?
Thank ing you in advance
?
73's
?
Ray

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