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You can make Am radio jammer using simple components :
1 transistor 2n2222
1 resistor 1 mega ohm
1 resistor 470 ohm
1 ceramic capacitor 1 nf "102"
1 variable capacitor 5-250P from an old radio 
center tap coil with ferrite core  90 turns "45 -45" as shown in picture
9 volt battery 



 
<p>Thank you for your diagram ! Where would I put my speaker in your diagram? im using a simple 8ohm speaker from Adafruit ?</p>
<p>Quite a errie sound.</p>
<p>Just used a transformer that hooked up to the 555 timer input voltage and added the 555 timer (second one) into the transformer. Creates an variable sound with other sound effects.</p>
<p>For my mid jammer if I attach another 1 mcs 555 timer to the transformer I can jam with different sound effects from the radio.</p>
<p>Note that this is a mid jammer. It would jam stations 88.8 and 88.4 MHZs but not 88.5 MHZS. </p>
<p>Oops forgot the pin 2 of the 555 timer that is connected to pin 6.</p>
<p>Radio Jammer circuit with 555 timer, transformer and switch. Blocks FM signals from 27 feet away.</p>
<p>My radio jammer is a 555 timer circuit with 10 and 1000 uf capacitors attached to pin 2 and ground. A switch between each parallel capacitors is set A B and C are the terminals of the switch. C attaches to the parallel capacitor 10 uf while B and A attaches to the combined 10 and 1000 uf capacitors. Then pin 3 attaches to an coil from a 130 in 1 electronic kit. There is no tuning capacitor but large distance 20 feet you can determine the buzzing sound through the radio. I </p>
<p>It is a cool radio fm jammer. Frequency most likely to Jam is 100.7 MHZ??</p><p>I think.</p>
<p>I have made a fm radio jammer with a 555 timer with switch to convert the 10 uf capacitor and 1000 uf capacitor to create a buzzer or other sound effects. I attached pin 3 of the 555 timer to a 130 in 1 electronic radio circuit. Works very well. I added a transformer and altered the pitch with 9 v and 4.5 volts. </p>
<p>can this jam down to 5mhz ? </p>
<p>can you help a create a jammer for 433 mhz?</p>
<p>tune the variable cap to obtain 433 mhz </p>
<p>circuit schematic </p>
<p>plzz send me gain ur circuite</p>

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