Tim Jackson
UNITED KINGDOM • + Follow
Description
Tim's 7555 Signal Injector
There is not much to say about this little tool.
It started as a challenge made by Richard at "Learn Electronics Repair"
It uses a CR425 battery to power a 7555 timer. (notice the 7, The timer will run with low voltage 3v).
The frequency like most 555 Timers can be changed by using different value resistors and capacitor.
The original use is to inject a signal (noise) into a circuit.
Because I have used a 7555 timer I am able to lower the frequency very low to inject slow pulses to drive logic circuits.
The videos show it all.
Schematic and Layout
Schematic
Signal Injector ICM7555.pdf
Aug 18,2025
229 views
Tim's 7555 Signal Injector
Inject a square wave into a circuit.
Frequency can be changed by Capacitor value selection.
229
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Published: Aug 18,2025
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File Last Updated: 2025/08/19 (GMT+8)
File update record
2025-08-1900:00:45
Centroid file is updated.
2025-08-1900:00:45
Parts List (BOM) is updated.
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Raspberry Pi 5 7 Inch Touch Screen IPS 1024x600 HD LCD HDMI-compatible Display for RPI 4B 3B+ OPI 5 AIDA64 PC Secondary Screen（Without Speaker）
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