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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Having some trouble with my circuit
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Musica_En_Fuego



Joined: Jun 19, 2018
Posts: 24
Location: New Castle, Delaware, USA

PostPosted: Sun May 26, 2019 6:58 pm    Post subject: Having some trouble with my circuit Reply with quote  Mark this post and the followings unread

https://photos.app.goo.gl/NczwE2cFbuoEXYMr9

It has been a while since I have been around here. But since my last visit here, I've been busy with my own little projects. My current project has mostly been successful, but I've hit a bump in the road. So looking at the drawing I have made. I encountered a problem I can't quite figure out how to solve.

You see, I have a gated oscillator connected to a On/On switch. One side goes to the 4040 and back to the 386 audio amp. The other goes directly to the 386. It seemed like it should have worked without any issue. But I found out that I was quite wrong. For some reason when the output of the oscillator is connected to the switch. The signal weakens, so much so that the rest of the circuit doesn't function properly. But when I connect the oscillator directly to the 4040 or directly to the 386. It functions just fine.

I'm thinking that a transistor may fix the issue by using it as a current amplifier.
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Harry



Joined: May 09, 2017
Posts: 20
Location: Texas

PostPosted: Mon May 27, 2019 8:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

You sure the switch is wired correctly? If the input to both the 386 and 4040 were bridged that could be an issue.

I would also probably wire the switch in a way that the 4040 outputs would be disconnected from the 386 input when not selected. Some of the outs could be left high and could interfere with your oscillator.
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Musica_En_Fuego



Joined: Jun 19, 2018
Posts: 24
Location: New Castle, Delaware, USA

PostPosted: Mon May 27, 2019 9:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

Figured out a solution. All I needed was a dpdt switch.
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Harry



Joined: May 09, 2017
Posts: 20
Location: Texas

PostPosted: Tue May 28, 2019 10:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

Glad you got it figured out. You should be able to get it working with an spdt btw. If you are using the 4040 as a frequency divider rather than a counter of sorts, you could leave the osc connected to the 4040 input and just switch between the oscillator and 4040’s outs to the 386.
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