[minima] Re: J310 mixer question
- From: Ik3nlk <mail@xxxxxxxxxx>
- To: "minima@xxxxxxxxxxxxx" <minima@xxxxxxxxxxxxx>
- Date: Thu, 27 Feb 2014 12:14:29 +0100
well I am not saying that it's the mixer going in autooscillation but does the
trim in some way induce some kind of noise that I ear like a strong whistle in
the speaker? I am not able to find where it's produced. I already tried to pug
more capacitors on the 78L05 regulator but no result.
73 Giorgio
Inviato da iPhone
Il giorno 27/feb/2014, alle ore 12:00, farhanbox@xxxxxxxxx ha scritto:
> The mixer is not active. It cannot go into oscillations at all!
> - f
> Sent from BlackBerry® on Airtel
>
> -----Original Message-----
> From: Ik3nlk <mail@xxxxxxxxxx>
> Sender: minima-bounce@xxxxxxxxxxxxx
> Date: Thu, 27 Feb 2014 10:45:06
> To: minima@xxxxxxxxxxxxx<minima@xxxxxxxxxxxxx>
> Reply-To: minima@xxxxxxxxxxxxx
> Subject: [minima] Re: J310 mixer question
>
> Thank you Steve and Jerry! I had this doubt because the mixer go in
> autooscillation when I turn the balance trimmer. Is it ok that I get those
> oscillations when I set the trim?
>
> 73 de Giorgio
>
> Inviato da iPhone
>
> Il giorno 26/feb/2014, alle ore 02:14, <jerry@xxxxxxxxxxxxxxxx> ha scritto:
>
>> On the schematic the arrow for the gate is centered meaning the device
>> is symmetrical. The drain and source can be switched with no ill
>> effects. Jerry
>>
>> K5LRU
>> Harwood, Texas
>>
>>> -------- Original Message --------
>>> Subject: [minima] Re: J310 mixer question
>>> From: "Steve VK2SJA" <vk2sja@xxxxxxxxxxx>
>>> Date: Tue, February 25, 2014 4:51 pm
>>> To: minima@xxxxxxxxxxxxx
>>>
>>>
>>> Hi Giorgio,
>>>
>>> Short answer. Does not matter. The J310 device is "symmetrical".
>>>
>>> For the long answer, look for the section entitled "Symmetrical
>>> Construction" in the link below:-
>>>
>>> http://www.cliftonlaboratories.com/jfet_variation.htm
>>>
>>> 73, Steve.
>>>
>>>
>>>> Hi
>>>> I have a doubt about J310 connections:
>>>>
>>>> are the 2 pin connected together to the trimmer via 4k7 resistor the
>>>> drains or sources?
>>>>
>>>> Sorry if this question was already andwered but I don't find any info.
>>>>
>>>> Thanks
>>>>
>>>> 73 Giorgio
>>>>
>>>> Inviato da iPhone
>
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