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Turner super sidekick schematic

Ocean cruiser

Active Member
May 20, 2019
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Hello again, while working on my radio a friend stops by and asked me if I could look at his Turner mic. I said sure, but I cant seem to find any schematic online that uses the LM386N IC. Would anyone happen to have one. Lmk thanks
 

Another version?
i have never seen a ssk with no output level adjustment under the mic, i make that 4 versions.
 
Thanks!

Found out something though...

Schematically - it's missing a value in the Pin 7 BYPASS - you just need a cap they recommend a value of 10uF so not sure of the value Turner would use...
TurnerSidekickLM386.jpg

But it does give us a direction to go...

The LM386 is pretty simple - so for output you'll need something I found from the CB Tricks site...

The Super Sidekick manual has this as Figure 4 - but there is several questions about IC used and the drawing is not very clear...
TurnerSidekickFig4.jpg .

A 4000 is a CMOS logic device - so I can only guess at that application - but a 2N4126 is a PNP.

Hope this helps!
 

Attachments

  • LM386SmallOutline.jpg
    LM386SmallOutline.jpg
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Thanks!

Found out something though...

Schematically - it's missing a value in the Pin 7 BYPASS - you just need a cap they recommend a value of 10uF so not sure of the value Turner would use...
View attachment 33900

But it does give us a direction to go...

The LM386 is pretty simple - so for output you'll need something I found from the CB Tricks site...

The Super Sidekick manual has this as Figure 4 - but there is several questions about IC used and the drawing is not very clear...
View attachment 33901 .

A 4000 is a CMOS logic device - so I can only guess at that application - but a 2N4126 is a PNP.

Hope this helps!
Yup, pin 7 to 10uf 25v to ground.
There is also pin 5 to a .05uf cap to what looks like a 10.0 ohm resistor to ground.
 
Thanks!

Found out something though...

Schematically - it's missing a value in the Pin 7 BYPASS - you just need a cap they recommend a value of 10uF so not sure of the value Turner would use...
View attachment 33900

But it does give us a direction to go...

The LM386 is pretty simple - so for output you'll need something I found from the CB Tricks site...

The Super Sidekick manual has this as Figure 4 - but there is several questions about IC used and the drawing is not very clear...
View attachment 33901 .

A 4000 is a CMOS logic device - so I can only guess at that application - but a 2N4126 is a PNP.

Hope this helps!
The 4000 chip is an MFC4000B it is a 250mw audio amp, it is a 4 pin device. The MC3360P is the same device in an 8 pin pkg. I am having trouble uploading the spec sheet, a google search should find them.
 
Well, I might be able to help...

Now that I know that...the MFC4000B did exist...

I found some stuff that might prove interesting. Google helped.

But give Motorola credit. They still kept a few of the sheets around for scanning. But again, sorry for the poor graphic, but these are simple scans...we're lucky to be able to find them...

This is not a LM386, but it is designed to act as a power amplifier for tiny radios - like the older handheld AM-Reception types that didn't need a lot of fidelity nor oomph to push out audio thru a tiny speaker. They are only about 0.25Watt ( 1/4-watt ) power and can support emphasis networks like EQ for RIAA - type phono equalization.

You'll see the EQ circuit and what I mean - the use of the PNP transistor is unique that it provides POSITIVE feedback thru the EQ circuit similar to that in a typical Stereo and if it wasn't for the PNP - instead to use NPN - can be used in a variety of radios from that era; including Uniden (AR-144, AX-144, Pro640e, PC-122) and Realtistic (TRC-453, TRC-465 etc...) that used SSB modes - just to name a few.

These can provide gain as well as a level of compression that is preset internally...

Here's what I got from the Net about this little gem...
Coversheet
MFC4000SeriesCoversheetsm.jpg

The "guts" schematic....
MFC4000SeriesInternalSchematic.jpg

Note - now you know why Uniden used 16ohm speakers...Power draw and stability inclusive...

Note also the INTERNAL versus EXTERNAL APPLICATION schematics...

Internal gain is set approx. 10 - 10K offset 750 and 1.6K respectively but uses a Push-Pull (SIC) complimentary design amplifier note the 3.9K and 360ohm with 2 diodes - for biasing - so the output floats at about 1/2 the battery supply to allow for some fidelity and low distortion even in weak or low battery power conditions.

Both use Equalization - to compensate for the bandwidth - a loudness contour if you follow, because you can design the network to Equalize as you see fit... Above, is a Series R/C circuit as well as Gain reduction.

External shows a better application with an RIAA EQ-based circuit for loudness offset for effect.
Note the similarity of the PNP transistor application and the Hi-cut filter used in the Turner Mic schematic...
MFC4000SeriesAdaptationSchematic.jpg

Hope this helps!
 
Last edited:
Here's the outline, which does show pinout but only 1 and 4 - so PRESUME Pin 1 as being "Home" and Pin 4 as "End" - again, PRESUME - Pin 2 upper left pin, Pin 3 upper right pin - as if you read this clockwise from lower bottom left.
MFC400BOutlinePinout.jpg

Just tried to straighten this drawing out to help others...
MFC4000SeriesInternalSchematicCorrected.png

MFC4000SeriesAdaptationSchematicCorrected.png
 

Attachments

  • TurnerSidekickFig4.jpg
    TurnerSidekickFig4.jpg
    99 KB · Views: 22
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