Replacing a 110v adapter on a cordless phone with a USB plug

[Mafine]

I am wondering if I can snip off the pnlv233 adapter from my panasonic cordless handset base and replace it with a USB plug that I could use anywhere (even traveling in Europe 220v)? The output on the adapter is 4.8v 0.16a and .768w.

 

[Delta Prime]

That all depends on the type of battery it was meant to charge take the back off of your handset on the cordless phone and look at the type of battery it uses

 

[Delta Prime]

Wait a second! If it's a 110 adapter like a common wall wart a 110 VAC to 4.8vDC adapter then NO! you will not be able to use it in Europe.

 

[Mafine]

it charges 2 AAA NiMH 1.2v batteries. I want to snip off the adapter that extra handset holder - all it does is recharges the 2 NIHM batteries - and put a USB at the end. Then plug that into a USB port on a European 220v to USB charger.

 

[Delta Prime]

I know yours is not a VTech but this is basically what you want to do yes? or no? thank you.
If the answer is yes then I would put a Schottky diode in series with positive 5volts which would drop the voltage down approximately 0.3 volts giving you around 4.7 4.8 volts. If this is not done you run the risk of overcharging the batteries they will heat up it will not last as long as they were intended.

 

[kellys_eye]

cordless handset base

To talk to who? Another 'cordless' (of the same series)?

If you want to make a phone call then use the local telephone. Your cordless set won't give you any functionality and certainly won't work with anything other than another handset of the same type/make.

 

[Mafine]

I know yours is not a VTech but this is basically what you want to do yes? or no? thank you.
If the answer is yes then I would put a Schottky diode in series with positive 5volts which would drop the voltage down approximately 0.3 volts giving you around 4.7 4.8 volts. If this is not done you run the risk of overcharging the batteries they will heat up it will not last as long as they were intended.

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Yes that's exactly what I want to do!

 

[Mafine]

To talk to who? Another 'cordless' (of the same series)?

If you want to make a phone call then use the local telephone. Your cordless set won't give you any functionality and certainly won't work with anything other than another handset of the same type/make.

Yes I have a phone that it connects to. My only question was charging the extra handset using a USB

 

[Delta Prime]

And the answer is yes!
I've done the same thing but with the Schottky diode although if you do not insert the diode you must remember not to keep it on the handset overnight just charge it until full and take it off the charger and that's a pain in that you know what!
And be careful who you talk to in Europe they're a bunch of crazy good people out there in The boondocks.

 

[Mafine]

To talk to who? Another 'cordless' (of the same series)?

If you want to make a phone call then use the local telephone. Your cordless set won't give you any functionality and certainly won't work with anything other than another handset of the same type/make.

Yes I have a phone that it connects to. My only question was charging the extra handset using a USB

And the answer is yes!
I've done the same thing but with the Schottky diode although if you do not insert the diode you must remember not to keep it on the handset overnight just charge it until full and take it off the charger and that's a pain in that you know what!
And be careful who you talk to in Europe they're a bunch of crazy good people out there in The boondocks.

Exactly which Schottky do I buy? and connect to the non load side?

 

[Delta Prime]

Exactly which Schottky do I buy? and connect to the non load side?

https://www.mouser.com/ProductDetail/STMicroelectronics/STPS1L60RL?qs=JquAdH79urZpCHmVrbMOgw%3D%3D

Schottky Diode 1 amp, package style
DO-41 reference the datasheet please.
(K) stands for cathode (A )stands for Anode.
The white stripe on the DO-41 package is the cathode (K) . That white stripe should be orientated towards your cradle in series with the positive side of the USB connector. If you have any
other questions please ask.
Also... these are general purpose Schottky Diodes you don't necessarily have to buy from Mauser. shop around they should be less than $1 U.S.

 

[Mafine]

Thanks!