Site Updated 1/29/2012
Scotts Electronic Parts
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For Sale MK484 AM Radio IC
The MK484 MK-484 MK 484 is a AM radio receiver IC has automatic gain and up to 72 db gain. It is cased in a TO-92 Case looks like a transistor. The MK 484 runs on 1.1 to 1.8 volts so a single 1 1/2 volt battery will work. Also the MK-484 needs a tuning Capacitor and Ferrite Rod Coil or also known as a loopstick antenna we sell both items.
The MK484 Kits are TRF ( Tuned Radio Frequency, Tuned RF ) type receivers. This the most basic type of radio receiver with no regeneration or re-genitive feedback. The variable capacitor and antenna coil form a "Tank" circuit that tunes the radio stations frequency then the MK484 amplifies the radio stations radio frequency then "Rectifies" (Converts to Audio) it then amplifies the audio and powers the Earphone.
Yes real MK484, not like other sites that sell MK484/TA7642. If you see this designation on other sites you are getting a TA7642 not a MK484.
I also have for sale the YS414, TA7642, UTC7642 and CD7642 sold seperatly at bottom of this page if you are looking for one of these instead of the MK484.
The YS414, TA7642, UTC7642, CD7642 are the same as the MK484 only different manufactures.
I do not ship equivalent parts if you order a MK484 I ship a MK484 not one of the others.
Contact Me At slowe15@cinci.rr.com
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I no longer ship Internationally, I only ship to USA addresses.
Below is a link to MK484 schematics for the MK484 kits.
MK484 Schematic Circuit Diagram for MK484-Radio-Kit-4.pdf
MK484 Schematic Circuit Diagram for MK484-Kit-5.pdf
MK484 Schematic Circuit Diagram for MK484-Kit-6.pdf
The PDF file below shows how to add an adjustable gain control to the MK484
MK484 Circuit Diagram for MK484AutoGain.pdf
Any of the above MK484 circuits will work with the YS414, TA7642, UTC7642, CD7642
For Sale MK484
MK484 Kit-4
MK484 Kit-5
This kit comes with (Mono 2000 Ohm High Impedance Headphones). With 1/4 plug ends.
MK484 Kit-6
This kit comes with a High Impedance Ceramic Headphone. Wire mono with 1/4 inch plug end cord is about 40 inches long.
The Piezoelectric functions the same as a Ceramic Earphone. The are not the homemade Headphones sold on other sites with Piezo Transducers, these were made by a Headphone Manufacturer special for me.
Order Variable Capacitors Here. The MK484 Kits Use the 60/141pf Models.
Two Sizes Ferrite Rod Antenna ( Loopstick Antenna Coils )
Picture on left Flat Rod types 5mm X 12mm X 55mm long. Two sizes 788uh Tap at center and tap about 10 turns from end and 680uh tap at 470uh. Picture on right 680 round rod 10mm X 60mm long ( about 3/8 inch X 2-3/8 long) Price $2.47 Each
The MK484 Kits Use The 680uh With Tap At 470uh.
The diameter is about that of a dime.
The diameter is about that of a nickel.
Mono High Impedance Headphones with 1/4 inch plug ends. The High Impedance Headphones have an Impedance of 2000 Ohm making them ideal for the MK484 Ic or the YS414, TA7642, UTC7642, CD7642.
Mono High Impedance Piezoelectric Headphones with 1/4 inch plug ends. These headphones have an Impedance of over 20 million ohms. Factory made not homemade.
Part # 1/4Jack-1, Mono 1/4 Phone Jack for my High Impedance Headphones Price $1.97 Each
For Sale TA7642
TA7642 - Radio Kit ( Same as the parts as the above MK484 Kit-4) only comes with TA7642 instead of the MK484.
For Sale YS414
YS414 - Radio Kit ( Same as the parts as the above MK484 Kit-4) only comes with YS414 instead of the MK484.
For Sale CD7642
CD7642 - Radio Kit ( Same as the parts as the above MK484 Kit-4) only comes with CD7642 instead of the MK484.
For Sale UTC7642
UTC7642 - Radio Kit ( Same as the parts as the above MK484 Kit-4) only comes with UTC7642 instead of the MK484.
Contact Me At slowe15@cinci.rr.com