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Posts tagged 1500

Circuit diagram 75 Meter QRP SSB Transceiver

The 75 Meter QRP SSB Transceiver Theory of Operation 6-30-03 In general, the transceiver switches the 4-element 1500 ohm xtal BPF ends between the inputs and outputs of the two SA602s to reverse the signal flow for R/T operation. Since no IF amplifier is used in the design, 20 dB of additional receiver gain is […]

Digit Led Display

Digit LED Display for audio level indicator using 7414, 7493A, 1N4148, 5v Led display board for audio level indicator using 7414, 7493A, 1N4148, 5v

Motor Control

Electric Motor circuit Motor Control circuit board

Temperature alarm circuit

Temperature alarm circuit using LM7215, ZVN4106F Temperature alarm circuit using LM7215, ZVN4106F

Radio 810 mw circuit

Radio 810 mw circuit using LM386 and ZN414 Radio 810 mw circuit using LM386 and ZN414

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