Circuit Diagram

Common Gate Amplifier Version

Published:2012/12/12 21:09:00 Author:muriel | Keyword: Common Gate Amplifier

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The Tuned Whip

Published:2012/12/12 21:08:00 Author:muriel | Keyword: Tuned Whip

Previous experimentation confirmed that it is easy to tune a short whip antenna by connecting it to the hot end of an L C (inductor and capacitor) tank circuit. The high impedance whip antenna was matched to a JFET RF amplifier by placing a high value (1 megohm or greater) on the JFET gate to ground. Although this method is practical, I desired a network to transform the output impedance of the tuned whip tank tank circuit to a known impedance. I do not possess the knowledge or mathematical skill to design such a network and asked Wes Hayward if he might consider doing this for me. My desired parameters for the network were 10.0 MHz, a 50 ohm output impedance and a 4 foot (122 cm) whip. Please refer to Wes' calculations and schematic in Figure 2 below. This math is difficult, however, a practical design for experimentation is provided.   (View)

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experimental broadband cascode JFET VPA

Published:2012/12/12 21:07:00 Author:muriel | Keyword: experimental , broadband , cascode, JFET VPA

Many builders emailed me requesting a simple, broadband VPA (voltage probe antenna) design with more power gain than the common gate versions I have presented elsewhere on this web site. Connecting a whip antenna to a cascode JFET stage described by W7ZOI in Experimental Methods in RF Design is 1 method I considered. I built the version shown in Figure 1 almost 2 years ago. This VPA. although more powerful, overloaded the front end of my test receiver with multiple RF signals. Clearly some tuning on the input was needed.   (View)

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The Cascode 7 Experimental Receiver 5

Published:2012/12/12 21:05:00 Author:muriel | Keyword: Cascode 7, Experimental Receiver

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The Cascode 7 Experimental Receiver 4

Published:2012/12/12 21:04:00 Author:muriel | Keyword: Cascode 7, Experimental Receiver

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The Cascode 7 Experimental Receiver3

Published:2012/12/12 21:03:00 Author:muriel | Keyword: Cascode 7, Experimental Receiver

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The Cascode 7 Experimental Receiver 2

Published:2012/12/12 21:03:00 Author:muriel | Keyword: Cascode 7, Experimental Receiver

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The Cascode 7 Experimental Receiver

Published:2012/12/12 21:02:00 Author:muriel | Keyword: Cascode 7, Experimental Receiver

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Telephone Recorder

Published:2012/12/12 20:59:00 Author:muriel | Keyword: Telephone Recorder

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Telephone Hold Button

Published:2012/12/12 20:59:00 Author:muriel | Keyword: Telephone Hold Button

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Simple Phone Tap

Published:2012/12/12 20:58:00 Author:muriel | Keyword: Simple Phone Tap

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Ringing Phone Light Flasher

Published:2012/12/12 20:57:00 Author:muriel | Keyword: Ringing Phone , Light Flasher

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Remote Telephone Ringer

Published:2012/12/12 20:56:00 Author:muriel | Keyword: Remote Telephone Ringer

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Phone Busy Indicator

Published:2012/12/12 20:55:00 Author:muriel | Keyword: Phone Busy Indicator

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FM Telephone Bug

Published:2012/12/12 20:55:00 Author:muriel | Keyword: FM Telephone Bug

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The connection schematic block circuit diagram of UC3907 and external circuit

Published:2012/12/12 3:27:00 Author:Ecco | Keyword: connection , external circuit

Current signal is sampling by an external shunt, RCS is generally connected with return branch in series, and it is sent to current amplifier by pin 2 and pin 3, the output voltage of the power module input uses by 11 feet and 4 feet differential signal, and it is superimposed with circulation.   (View)

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82C250 functional block circuit diagram

Published:2012/12/12 2:58:00 Author:Ecco | Keyword: functional block

Figure 1 shows a functional block diagram between CAN controller and interface circuit 82C250 of physical bus. 82C250 is able to provide differential receive and transmit functions for bus to achieve electrical isolation between each node on the bus, and the maximum transmission rate is up to 1 Mb / s.   (View)

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Timer alarm circuit using NE555

Published:2012/12/12 2:52:00 Author:Ecco | Keyword: Timer alarm

Timer alarm circuit using NE555 is shown as the figure.   (View)

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PWM inverter over-current protection circuit diagram

Published:2012/12/12 2:51:00 Author:Ecco | Keyword: PWM inverter , over-current protection

It can prevent IGBT or MOSFET output stage from being damaged by large current flowing. The maximum current is 23A when the motor is overcurrent, and the overcurrent needs 3μs flowing to protection circuit.   (View)

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ICL8043 dual JFET input op amp and its main characteristics

Published:2012/12/12 2:32:00 Author:Ecco | Keyword: dual JFET , input op amp, main characteristics

Input offset voltage is 10mV ; temperature drift is 75μV / ℃; bias current is 2pA ; Gain Bandwidth Product GB = 1MHz; conversion rate is 6V/μs ; Current consumption is 4.5mA ; power supply is ± 18V; differential input voltage is ± 30V ; common-mode input voltage is ± 15V; ​​power consumption is 500mW.   (View)

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