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This is Digital Rf Probe for Vom Circuit Diagram. This probe makes possible relative measurements of Rf voltages to 200 MHz on a 20,000 ohms-per-volt multimeter Rf voltage must not exceed the breakdown rating of the 1N4149—approximately 100 V. Digital Rf Probe for Vom Circuit Diagram

When testing circuits with a logic probe, it is sometimes difficult to watch the LEDS on the probe to determine the logic state. With this probe the logic states are audible. This probe is designed for TTL circuits only but could be modified for CMOS. The way it works is as follows. The 5 volt power source will be the circuit under test. Clip the ground input of the probe to the ground of the circuit being tested. The other input lead is used to probe the different chips of the circuit being tested. Any input greater then 2 volts will be high and output a high tone through the speaker. Any input less then .8 volts will be low and produce a low tone through the speaker. Audible Logic Probe Circuit Diagram Source : extreamcircuits.net

This is the RF Probe for Multimeter Circuit Diagram. To measure the RF voltage in a circuit to convert the signal unless they RF voltmeter. This conversion may be done with a very simple circuit, called a point or RF probe. A tip for RF Multimeter has to be made in a metal box with two connectors, one that receives the RF signal and another that goes to the multimeter.  In the case of this circuit the signal passes through two connectors between them and the RF signal is picked up.This signal passes through a 18 pF capacitor, a diode germanium, a resistor of 47 kOhm, and a bypass capacitor 33 nF. The anode of the diode is connected to the positive lead of the voltmeter and the other to ground. RF Probe for Multimeter Circuit Diagram