Dansette Apollo to Bluetooth.

[Test Desk]

Thanks. I get shopping and have a play.

[Gabe001]

With regards to the resistor, I meant 4ohm or 8ohm etc, not 4w or 8w. I imagine you realised but just in case

[Edward Huggins]

We need to know the Chip that RBM used. From that we might deduce the impedence load value

[Test Desk]

Does this look right?

[Gabe001]

My 2p. The potentiometer is a voltage divider, you probably need to drop the voltage about 5 to10 fold depending on how many watts the record player outputs.

What BT module are you using and how are you going to power it?

[Test Desk]

I thought initially I would feed this signal directly into my BT speaker at a very low level and experiment until I was satisfied there was adequate signal without distortion. Would that work the way I've drawn it?
I'm thinking if it does, then I can install the transmitter afterwards.
Cheers!

[Test Desk]

Ah, sorry. I've just seen your suggested circuit.

[Test Desk]

Have I really got a 12 ohm speaker?

[Edward Huggins]

Well that certainly looks like it.

[Gabe001]

You will need a 12ohm 50 W resistor.
https://www.ebay.co.uk/itm/50W-Alumi...-127635-2958-0

[wd40addict]

Why 50W? That amplifier looks capable of about 1W tops judging by the output transistors. A 3 or 6W part would be plenty.

It is a transistor amplifier and will work without a load, probably better than with.

[Gabe001]

Originally Posted by wd40addict

Why 50W? That amplifier looks capable of about 1W tops judging by the output transistors. A 3 or 6W part would be plenty.

I didn't know it's only 1W. I was assuming 4-8w, in which case the resistor could get reasonably hot. In any case they're cheap enough

[bikerhifinut]

Originally Posted by merlinmaxwell

It is a transistor amplifier and will work without a load, probably better than with.

I alluded to this in my orignal post.
Merlin speaks wisely.
I fear you're in danger of overthinking this
A simple potentiometer across the output, if its a high ish resistance, say 10k the power amp probably won't develop any great amount of power so you are unlikely to get the pot war.m.
If you're really that nervous then get a 15ohm or thereabouts resistor rated at the amps output and bung that across the output, then a polyester capacitor, say 1uF at 22V or better onto the top of a 10k pot and the wiper to your BT input.
Have you got a copy of the circuit for us to look at?

A.

[Test Desk]

Hi all.
Thanks for all your input.
I can't find a cct diagram for my little Dansette and I really don't mind that my player has a tiny speaker and an amp to match, hence the Bluetooth query.
I would appreciate any suggestions to extract an output from the amp in a diagram form, as I can read a diagram, even if I can't draw one correctly ;-)
As I haven't done much restoration, I don't have a workshop full of components so I've ordered the parts for Gabriel's potentiometer circuit, as this seems the simplest solution for a novice like me.
As I said, if I can hard wire the amp o/p to my BT speaker, I can worry about the wireless aspect later. I just don't want to damage anything achieving a suitable signal.

[Gabe001]

Originally Posted by bikerhifinut

I alluded to this in my orignal post.
Merlin speaks wisely.
I fear you're in danger of overthinking this
A simple potentiometer across the output, if its a high ish resistance, say 10k the power amp probably won't develop any great amount of power so you are unlikely to get the pot war.m.
If you're really that nervous then get a 15ohm or thereabouts resistor rated at the amps output and bung that across the output, then a polyester capacitor, say 1uF at 22V or better onto the top of a 10k pot and the wiper to your BT input.
Have you got a copy of the circuit for us to look at?

A.

Andy, this is what I drew for him in post 25, based upon your previous post.

[Station X]

The picture in post #28 shows a transistor amplifier which looks identical to that in the Bush RP73.

https://www.service-data.com/section.php/9580/1/rp73

[Herald1360]

Which indeed has a 12ohm speaker and an output capability of maybe 1.5W.
(3W music power quoted.)

[Gabe001]

No wonder the OP wants to play it on a different speaker.

So, RMS output x2 = "music power"? Lol

[Test Desk]

So I've downloaded the cct diagram ( thanks for the link), and some bits have arrived. I've got a 12 ohm 10 watt wire wound cement resistor. No capacitor yet but I have a 100k trimmer pot thinking once it's set, I shouldn't need adjustment. I didn't realise it would only be 1/4" square! It was unrated so I'm concerned as to whether it will get hot/ melt? It could form the start of a collection of spare components
I could post a screen dump of the cct diagram if that's not breaking any forum rules?
Thanks again!