The logic test pen production kit, mainly used for the introduction of a CD4511BE to control a digital tube display logic pen, CD4511BE internal includes two independent, high gain, internal frequency compensation of the double operation Amplifier, suitable for a wide range of power supply voltage range of single power supply, but also for dual power mode, the recommended operating conditions, the supply current and power supply voltage has nothing to do.
It uses areas such as sense amplifiers, DC gain modules, audio amplifiers, industrial controls, DC gain components, and all other commercially available single-supply operational amplifiers.
1.When INPUT port hasn't input voltage,that is when A-B/C-D both disconnect,VIN is connected,CD4511 2-pin,4-pin are low level;since IC1 the fourth pin is blanking input control port;when BI=0,no matter what other input ports' state are,its output port A-G are all 0;and 7 segment digital tube are all off and not display number
2.When INPUT port inputs low level which is lower than 0.47V,that is short circuit INPUT C-D port,VT1 cut off,and its collector output high level;IC1 BCD code input DCBA=0100,after decoding,IC1 output port B/C/F/E is high level,and others are low level.So digital tube display "L" representing logic low level
3.INPUT port input 3.13-5V high level,that is short circuit INPUT A-B port,VT1 is connected;its base and collector are both high level,IC1 BCD code input DCBA=0110;after decoding,IC1 output port A/C/D/E/F/G output high level;and others are low level;digital tube display "H" representing logic high level
1-Bit Digital Tube
Common Cathode 0.56
Short Circuit Cap