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Posts tagged RF

Making RF Switching for terror

When switching an antenna between a transmitter and receiver, the 1N914 or 1N4148 can still be used, but with decreasing success as the frequency rises. It is common practice in VHF transcievers to use a PN junction diode, but with a lightly doped “Intrinsic” region between the P and N layers. The diode is called […]

Spectrum Analyzer

3 Channel Spectrum Analyzer using LM3900, AN6884 3 Channel Spectrum Analyzer using LM3900, AN6884 Parts: R1 100K 1/4W Resistor R2 820K 1/4W Resistor R3, R14, R16, R18 2.2 Meg 1/4W Resistor R4, R5, R6 22K Pot R7, R8, R9, R25, R27, R29 10K 1/4W Resistor R10, R11, R12 680 Ohm 1/4W Resistor R13. R15, R17 […]

sound design equipment

sound design equipment Mixer 10 Chanels for Shure Microphone systems sound design equipment Part R1,2,9                 2K2 R3,10                 47K R4,20,21,22             22K R5,111                 4K7 R6,8,12,13,14,16,17,18,19    10K R7                 100 Ohm R15                 68K POT 1,2,3,4,6    […]

Flip Flop for speed pulse generator

Flip Flop for speed pulse generator circuit using 4013, 74HCT74

Single Cell LED Driver using LT1932

Single Cell LED Driver circuit using LT1932

Lights & LED Circuits & Schematics LDR

An ordinary automatic room power control circuit has only one light sensor. The circuit uses two LDRs which are placed one after another (separated by a distance of say half a metre) so that they may separately sense a person going into the room or coming out of the room. Outputs of the two LDR […]

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