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  • 12L6 One Tube DX Radio

    2017-09-08 00:45:0760

    Introduction With the 2008 1AD contest coming up soon, I had to throw something together. I still may use a different receiver as I have a couple more ...

  • Tremolo Circuit

    2017-09-07 23:00:5160

    This circuit adds a VLF AM component to an audio signal. This effect is widely used in musical instruments. U1C, a phase-sh ift oscillator operating at...

  • Analog De-Glitch Circuit Circuit

    2017-09-07 22:18:2762

    Low-frequency signals produced by transducers, measurement equipment, or data loggers often appear like the first waveform in the figure. The circuit s...

  • Wideband noise generator

    2017-09-07 21:23:0760

    This circuit will produce wideband rf noise. It uses a reverse-biased diode and has a low-impedance output Can be used to align receivers for optimum p...

  • Dual Litz Honeycomb Coils Crystal Radio

    2017-09-07 21:18:0061

    I hope that this crystal set is well received by all of you. My #62 radio combines the features of some of my earlier radios. It combines the one piece...

  • Low Noise 4 Channel Guitar Mixer Circuit

    2017-09-07 19:44:1063

    ICl-a, ICl-b, IC2-a, and IC2-b all function with a gain of about 19. Their outputs are mixed via the level-control pots and the resulting signal amplif...

  • PC serial port buffer

    2017-09-07 19:06:0663

    PC serial port buffer Summary of circuit features Brief description of operation: Buffer to run RS-232 data to longer distanced as normallyCircuit prot...

  • High output 600 Ohm line driver

    2017-09-07 17:35:1660

    The circuit has a `floating` output, i.e., it behaves like an isolated transformer winding, with the output amplitude remaining unchanged whether the c...

  • Bird chirp

    2017-09-07 17:11:2060

    For a barking dog, the capacitor at pin 17 is changed to 15 pF to increase the frequency of the VCO. here is the bird chirp sound circuit diagram. Repr...

  • Active-antenna

    2017-09-07 15:47:2060

    All capacitors in this circuit are disc ceramic. Fixed-value resistors are 1/.-or 1/2-W carbon. Rl controls the gain of Ul. RFCl is a miniature 2.5mH r...

  • Integrated-am-receiver

    2017-09-07 14:37:1061

    A crystal Oscillator Ia used so that a narrow?·band hybrid IF filter can be used. This circuit has aerial and local oscillator circuits for a 27-MHz r...

  • Electronic-tremolo

    2017-09-07 12:50:2863

    The tremolo effect is generated by a repeating volume change at a rate usually between 1 and 15Hz. The timer produces a low frequency square wave that ...

  • ADA flanger clone [MN3007]

    2017-09-07 11:54:2663

    This is an A/DA flanger circuit like the previous PCBs I have offered in the past, but it has been reworked to replace the SAD1024 (which has become ne...

  • KA431 Sophisticated Jizhun De Pressure Integrated Circuits

    2017-09-07 09:09:3661

    KA431 precision reference voltage regulator integrated circuits produced by South Koreas Samsung, is widely used in color TV, stereo, air conditioning,...

  • Tone burst generator

    2017-09-07 09:07:2160

    The first timer is used as amonostable and determines the tone duration when triggered by a positive pulse at pin 6. The second timer is enabled by the...

  • Receiver/Scanner Preamp Circuit

    2017-09-07 09:01:4462

    The low-cost Mini-Circuits MAR-X series of chips offer the RF builder a real advantage, with their inherent 50- input and output impedances (needed for...

  • Instrument preamp

    2017-09-07 08:33:3260

    The input impedance is the value of potentiometer Rl. If your instrument has extra-deep bass, change capacitor Cl to 0.5 mF. What appears to be an extr...

  • Crystal Radio Sixty Nine DX Radio

    2017-09-07 08:17:4661

    This is continued from the previous page. The Contra Connection Before we get started with the formal discussion of the construction of my #68 and #69 ...

  • Steam locomotive whistle

    2017-09-07 07:46:3461

    The waveform of a steam whistle is a complex combination of white noise and an audio frequency oscillation. The noise generator is a transistor (Ql) bi...

  • Balanced driver for line signals

    2017-09-07 07:12:5360

    This circuit will handle 24 dBm with ?± 12 volts supply using TDA 1034s. This circuit uses current and voltage feedback. Reprinted Url Of This Article...

  • Homemade Tube Reflex Radio

    2017-09-07 06:10:3161

    Hello friends. Today I am presenting to you myhomemade reflex one tuber. It could be called a two tube set as thereare two sections to the one tube. Th...

  • Ultrasonic-pest-repeller

    2017-09-07 05:38:4061

    This circuit is a 555 timer IC connected as a square-wave generator. Its base frequency is approximately 45kHz, as detennined by the values of Rl, R2, ...

  • Output-limiter

    2017-09-07 05:12:4060

    HA-5190 is rated for ?±5 V output swing, and saturates at ?±7 V. As with most op amps, recovery from output saturation is slow compared to the amplif...

  • Four channel dimmer rack

    2017-09-07 04:39:4860

    Technical specifications Power input: 230V AC 50 Hz 10A max.Number of output channels: 4Output power: 900W maximum per channel, 2300W maximum totalFusi...

  • Cigar Box Radio - Crystal Set

    2017-09-07 04:16:5360

    Now dont e-mail me and tell me that I ruined a cigar box worth $500.00. That would just wreck my day! This is one of those fun type radios, folks. Noth...

  • CW signal processor

    2017-09-07 03:30:1660

    This circuit provides interferenced rejection for the CW operator. The 567 phase-locked loop is configured to respond to tones from 500 to 1100 Hz. The...

  • Music synthesizer

    2017-09-07 03:15:3860

    Three modes of operation are available in the music synthesizer mode play a note, play one of four stored tunes, or record a tune for subsequent replay...

  • Low-cost-half-duplex-information-transmission-link

    2017-09-07 03:10:5660

    In a half-duplex system, information can flow in both directions, but only one direction at any given time. The conventional method of building a half-...

  • Vlf/Vhf Wideband Low-Noise Active Antenna Circuit

    2017-09-07 01:37:4861

    A 30- to 50-cm whip antenna provides reception from 10 kHz to over 220 MHz. Tl, a dual-gate MOSFET, provides low noise, high-input impedance, and high ...

  • Hum Reducer For Direct-Conversion Receivers Circuit

    2017-09-07 01:03:4460

    One cure for ac power line hum and ripple (caused by leakage current) is to use a well-reg-ulated and filtered 9- to 18-Vdc power supply with a balanci...

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