Signal tracking injector, Signal Generator
Keywords: signal generating circuit, signal injection circuit
First, the circuit schematic of the signal tracking / injector is shown below. Among them, Va, VB, GND end is a power supply terminal, a battery or an AC power source. By voltage regulator ZD1, the two voltages of + V1 and + V2 will be supplied to the circuit.
The signal tracking function is implemented by the circuit in the upper right corner. The signal is input by the In-side, the potentiometer RV2 adjusts the amplitude of the input signal (ie, the adjustment sensitivity), and the transmission IC1 is enlarged and the drive speaker LS sound indication is driven. The signal injection function is implemented by the lower part of the figure below. The capacitances C1, C2, C3, the resistors R2, R3, R4, R8, and the triode T1 constitute a 1 kHz oscillator, and the oscillation signal is amplified after T2, and after the potentiometer RV1 is saved, the circuit is injected from the OUT end.
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Second, components and installation
The circuit of the signal tracking / injector is very simple, so it can be designed on a single panel to design PCB and solder. The PCB device layout and positive and reversed surface view are shown below. The welding of the PCB is completed in conjunction with the prompt of the PCB front wire printing layer.
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Third, how to let it work hard after welding the required device, connect the table written with the tracking / injection to the board, turn the two potentiometers counterclockwise to the minimum, put a speaker (at least 4Ω, 05W) and the circuit. The LS hole on the plate is connected to the hole labeled "┴". The signal tracking the power supply is flexible, and the method of the picture (Double 7 to 9VAC) is connected to VA and VB, and the common ground of the transformer is connected to the "upper" hole above the board VB. It is also possible to connect with a 9V battery, which is connected to Va or Vb, and its negative electrode is connected to "upper".
Test signal tracking / 180 is also very easy to work properly, just need to connect the output and the input sheet, gradually adjust the two potentiometers, if you pass the "..." sound from the speaker. Indicates that the circuit has been working properly and can be put into use. When used, the ground wire of the signal tracking / injector is connected to the ground of the measured circuit, and the input or output probe is connected to the circuit of the circuit (such as the base of the triode), which can be positioned. The fault point is.
An example of a test, as shown in the figure below is a circuit diagram of a rry A amplifier, can connect the signal output signal output of the signal tracking / injector to the input (1n) of the amplifier, and the amplitude of this output signal is minimized to avoid Burntable amplifier assembly. In this way, inject a standard 1kHz test signal to the circuit, then connect the input of the signal tracking / injector to the output of the power amplifier (() UT), slowly adjust the output signal potentiometer, if the signal tracking / injector The speaker heard the signal sound, indicating that the power amplifier is working. According to such a method, the signal tracking / 18 can also simply detect the signal of other circuits.
Fourth, how to use the signal tracking / injector after making the completion is very simple, and the appearance is shown below. Specifications are shown in the following table. From the PCB, it only has more than 30 components, and it is very common resistance, capacitance, triode, op amp. The external interface reserved on the PCB is also very concise, mainly to power the signal tracking / injector and input output interface. There are also two potentiometers for adjusting the intensity of injection signal strength and tracking signal sensitivity.
Specifications
Output power: 0.5W / 8Ω
Working voltage: 7 ~ 9V AC or 9 ~ 12V DC / 150RNA
Size: 60mm × 53mm
Signal injection
Signal tracking
Output: 0-2.5Vrms (adjustable)
Sensitivity: 3.5MV-10VRMS (adjustable)
Output impedance: 1.5KΩ
Gain: 40dB
Output frequency: 1KHz
Input impedance: 50KΩ
So, how to make the signal tracking / injector work? First, two probes are installed as shown in the diagram and the map, which can use a category of an oscilloscope. At the lower left corner and the lower right corner of the circuit board of the signal tracking / injection, the output and input can be mounted, pay attention, pay attention to the shield of the mounting hole welding table pen labeled GND and "┴" on the board, preventing no occurrence The necessary interference.
When using the signal tracking function, the input probe is connected to the circuit's measured node, and if the signal is normal, the signal is captured and amplified by the signal tracking / injector, and is played by the speaker, as shown below. It can determine whether the previous part of the previous part of the node is working properly according to this replayed signal. Similarly, when using a signal injection function, simply connect the output probe to a node of the circuit, if the next node appears with the corresponding signal, the circuit between the two nodes is working properly. For example, in Figure 3, the output probe of the signal tracking / injector is accessed between "Filter" and "Large Again", then there will be an enlarged in "main amplifier" and "execution". Signal, and this signal is the same as the injected signal frequency.
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