HA-PRO2 with BT module - help needed

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avg007

Member
Joined 2020
#1
Dear DIYers,

Just ordered an HA-PRO2 DIY kit as I'm planning it as a gift to my dad.

I would like to add a bluetooth module as well and a input selector DPDT switch to choose between line in and BT.

My question is: what is the best way to include a Bluetooth module in the system? How should I power it?

I have a normal 2X12V AC toroidal transformer but both secondaries will be connected to the power input of the amp (as I need to connect it as center tapped)ű. So how should I power the 5V DC BT module?

I'm thinking about to have a 12V-5V DC step down converter with its input wired to 1 of the secondaries and the other end to a 5V DC isolator but maybe this is not a good idea. Maybe it is even harmful to wire another board to a secondary which is already in use?

Or should I use a separate transformer hooked up to the same IEC as the main transformer?

Any tips would be very welcomed as I'm not a electrician nor an engineer.

Thanks,
G
 
#2
You can not use DC step down converter connected at transformer secondary because secondary is AC! But you can connect DC converter to positive side of rectified and smoothed amp supply if supply voltage is within range of DC converter input.
 
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