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Category: Meter Counter Circuits / Meters Circuits This circuit is also crossed to: Led circuits Views: 2335 Rank: 0 Using inexpensive components, you can fit a simple probe circuit into a pencil-sized enclosure. When both LEDs are on, the probe indicates the presence of an ac voltage; either LED alone indicates the presence and polarity of a dc voltage. The diode-bridge arrangement allows one-way current source R1, R2, Q1, and Q2 to light either LED (or both) when the probe is activated by a test voltage.Diodes provide the necessary peak-inverse voltage rating; R3 and C1 provide a spike-suppression network to protect the current-source transistors. visit page. Diodes provide the necessary peak-inverse voltage rating; R3 and C1 provide a spike-suppression network to protect the current-source transistors. http://www.circuitsuggest.com/4-220-v-test-probe.html
Related circuits The logic voltage is applied simultaneously to the sample and hold JFETs Oscilloscope-counter-preamplifier The circuit will provide a 20 ±0.1 dB voltage gain from 500 kHz to 50 MHz. The low-frequency response of the amplifier can be extended by increasing the value of the 0.05-JLF capacitor connected in series with the input terminal. This circuit will yield an input-noise level of approximately... Dual-trace, triggered oscilloscope This site contains public-domain schematics for a dual-trace, triggered oscilloscope, and some theory. Click on the topic in the table below to see the schematic for that block. I designed and built this oscilloscope in 1986 using the chassis of a non-working vacuum tube oscilloscope, keeping... Time Domain Reflectometer schematic This circuit is best powered with 4.5V battery or three 1.5V AA batteries connected in series. The + from battery goes to IC1 pin 14. The pin 7 of IC1 is connected to circuit ground which is connected to circut ground. Remeber to put a 100 nF (ceramic or polypropylene) capacitor between IC1 pins... Transistor trio makes vector anemometer A previously published Design Idea (Reference 1) uses a heated transistor as an airspeed-to-frequency converter. Because it uses only one transistor, the circuit cannot determine the direction of airflow. Alternatively, a circuit that uses a trio of hot transistors can digitize both wind speed... An electret microphone feeds an audio amplifier/rectifier combination. The amplifier has switchable gain. The rectifier o The JFETs, Ql and Q2, provide complete buffering to Cl, the sample and hold capacitor. During sample, Ql is turned on and provides a path, rds(on), for charging Cl. During hold, Ql is turned off, thus leaving Ql Id (< 100 pA) and Q2 Igss (< 100 pA) as the only discharge paths Very-short-pulse-width-measurer This circuit operates by charging a small capacitor from a constant-current source when the pulse to be measured is present. Dual pnp transistor Q3 is the current source; its output current equals the LM329 reference voltage divided by the resistance of potentiometer Rl. When the input is high... Robinsons' test probe
How to use a Multimeter for beginners: Part 1 - Voltage measurement
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