L1 3 Vueltas sobre ferrite de 5x10mm L2 3 Vueltas sobre aire de 9mm (largo 10mm) L3 1 Vuelta sobre aire de 12mm L4 4 Vueltas sobre aire de 9mm (largo 12mm) L5 2.5 Vueltas sobre ferrite de 5x10mm L6 1 Vuelta sobre aire de 12mm L7 2.5 Vueltas sobre ferrite tipo HF de 10x5mm [...]

Parts: C1-C4 = 10-80pF L1 = 1 coils of diameter of 10mms, 1mm C5 = 10nF L2 = 7 coils of diameter of 10mms, 0,8mms C6 = 1000pF L3 = 3 coils of diameter of 10mms, 1mm C7 = 100nF TR1 = BLY90 C8 = 2200mF/35V A amplifier of force RF for the FM, is [...]

Simple IR Remote Control Connect this circuit to any of your home appliances (lamp, fan, radio, etc) to make the appliance turn on/off from a TV, VCD or DVD remote control. The circuit can be activated from up to 10 metres. The 38kHz infrared (IR) rays generated by the remote control are received by IR [...]

Q1 NPN MPS3904 Transistor Q2 PNP MPS2907 Transistor Q3 NPN MPS2222A Transistor Q4 NTE342 (cross reference 2SC1971) L1 & L2 are air-core coils…8mm diameter…3 turn wrap…1 turn tap (L1 is tapped one full turn from the diode side (D1) of the coil…L2 is tapped one full turn from the collector side of the MPS222A transistor) [...]

The Circuit shown can transmit voice to exceptionally good range. Tune trimmer to hear the signal to your near radio. Frequency range is 88-108 MHz. Max current consumption is 30mA.

A stereo power amp designed for use in portable players and radios. A 3V supply can be used to drive headphones providing 20mW in 32 Ohms per channel, and a 9V supply will provide 1W in 8 Ohm per channel for small loudspeakers.

Download eprom: KOPERNIKUS 21C32

The circuit shown depicts a wide band FM wireless microphone. Its power and range are similar to the commonly known circuits, which use bipolar transistors. The simplicity of the design means it is certain to work first time. One gate circuit of the MOSFET is a self excited RF oscillator, and the other gate circuit [...]