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 dawia psu ps 120m

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rabbi
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Call Sign : m3kbd/2e0kbd/m0kbd
Posts : 117
Times Thanked : 1
Join date : 2019-07-04
QTH or Location : stockton on tees
Equipment Used : kenwood ts 2000x ascom 70mhz icom vlf/hf/uhf receivers multiband antennas
Age : 63

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PostSubject: dawia psu ps 120m    dawia psu ps 120m  Icon_minitimeSat Jul 02, 2022 8:39 pm

hi ihave fitted 2 new 2n3055h voltage regulators and up and running psu i looked up youtube and there recomend fitting overvoltage a tvs diode but unsure of the type needed i am coughing a lot the covid but still doing radio 73s paul m0kbd/sarah m6pii  bounce

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Victor
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Victor


Call Sign : 26-CT-3228 Ham M7VIC
Posts : 3719
Times Thanked : 225
Join date : 2019-11-10
QTH or Location : Bedford
Equipment Used : Various

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PostSubject: Re: dawia psu ps 120m    dawia psu ps 120m  Icon_minitimeSun Jul 03, 2022 7:40 am

Hi Paul,

I see you're still plugging away with that power supply. Wink


A 'TVS' diode is a "Transient Voltage Suppression" diode and they come in a variety of current and voltage ratings. 

When used to protect a typical Ham radio setup a 15 Volt, 1500 Watt is usually utilised and a quick search turns up these :-

https://www.amazon.co.uk/20-Pieces-1-5KE15CA-DO-201AD-Bidirectional/dp/B079KHNJHZ


They're often assisted by a 'crowbar protection circuit', (thyristor/zener over voltage circuit), such as used here :-

https://www.radio-workshop.co.uk/g4nsj-power-supplies-13-8-volt/


A search on the old internet will provide a plethora of similar circuitry but it's helpful to know what to type in that old search box first.


The only problem I can envisage is that your power supply from what I've gathered from you is a variable voltage type. In which case adding this additional circuitry will mean that you won't be able to adjust above 15 volts. (That might be a good thing depending on what you wanted from the power supply.) You could always switch it out depending on your use.

As ever these type of circuits aren't 100% guaranteed to protect your expensive radio but certainly better than just using a simple fuse.

I wish you well with it Paul as I know you like tinkering with this sort of stuff.


Also I hope that both you and Sarah are recovering well from your Covid bout, there certainly seems to be a lot of it going around.

Take care and all the best,
Victor

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rabbi
Senior contributor
Senior contributor



Call Sign : m3kbd/2e0kbd/m0kbd
Posts : 117
Times Thanked : 1
Join date : 2019-07-04
QTH or Location : stockton on tees
Equipment Used : kenwood ts 2000x ascom 70mhz icom vlf/hf/uhf receivers multiband antennas
Age : 63

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PostSubject: Re: dawia psu ps 120m    dawia psu ps 120m  Icon_minitimeWed Jul 13, 2022 5:45 pm

hi the daiwa 120m psu is now fixed with over voltage protection tws 15.3 volt i enjoy sorting out faults before my retirement  i was a technician at college thanks for looking paul m0kbd 73s

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