Simple but effective 2,4 Ghz jammer. This module can block BT and WIFI, to block spying wifi cameras or loud neighbour using bt speaker. I designed it so that the cost of making this was as low as possible due to chip shortage. There is a simple astable multivibrator with square wave to saw wave conventer to generate the VCO control signal. The 5.1V power supply is provided by the MT3608L converter, so the device can be powered from any lipo battery, but be sure that the battery can provide at least 500mA of current, if you want to use the amplifier, the current must be at least 1A. VCO is outputing about 2100 to 2600 Mhz sweep signal. Output power is about 5-10mW, you can use amplfer if you want bigger range. CHRG pads are used for battery charge, i recommend TP4056 module, 5V out pad are to connect power for amplifer. SWEEP OUT pad is used for output wave calibration, adjust wave shape by the ADJ potentiometer, correct signal should look something like this:

Don't use this crappy aliexpres 10dbi, 12dbi 18dbi fake antennas, the best way is to bulid your own biquad antenna

https://buildyourownantenna.blogspot.com/2014/07/double-biquad-sector-antenna-for-2450-mhz-wifi.html

I attach a .STL file for cool 3d printed antenna case.

To disrupt the signal, point the jammer at the receiver, remember that the effectiveness of jamming depends on the distance between the transmitter and the receiver. When the phone is 20cm from the loudspeaker, jamming is almost impossible, but when the phone is 2m away, the jammer can easily block the signal within a few to several meters.

Amplifers:

100mW amplifer ---> https://pl.aliexpress.com/item/1005001349703713.html?spm=a2g0o.detail.1000014.2.b64f7a47mEAwiK&gps-id=pcDetailBottomMoreOtherSeller&scm=1007.40050.281175.0&scm_id=1007.40050.281175.0&scm-url=1007.40050.281175.0&pvid=2b1b125a-3fb0-4dd6-8901-842872d3c691&_t=gps-id:pcDetailBottomMoreOtherSeller,scm-url:1007.40050.281175.0,pvid:2b1b125a-3fb0-4dd6-8901-842872d3c691,tpp_buckets:668%232846%238108%231977&pdp_ext_f=%7B"sku_id"%3A"12000015775836183"%2C"sceneId"%3A"30050"%7D&pdp_npi=2%40dis%21PLN%2121.43%2117.15%21%21%21%21%21%40211b5e1e16657402442047182ed6ab%2112000015775836183%21rec

1W amplifer ---> https://pl.aliexpress.com/item/1005002354103693.html?spm=a2g0o.order_list.0.0.37e01c24IXT8Uk&gatewayAdapt=glo2pol

Used VCO: https://pl.aliexpress.com/item/1005002503822581.html

You can use other model than YSGM232508 such as SV2450 or SM2400, pinout should look something like this:

Watch out for a VCO with the shield soldered backwards , make sure the RF OUT pin is in the upper right corner on the PCB:

Pcb hole dimmensions for case attach:

Remember that improper use of the jammer may lead to criminal liability, project only for educational purpose !