The basic electronic circuit trainer consisting of the following boards:  Basic Electronic Circuits, Diode and Transistor Switch, Inverter and Inverter/Non-Inverter OP Amp , Voltage Follower and Comparator, Zero-Crossing Detector  Photoelectric Controller , Waveform Generator Circuits, Schmitt Trigger and Sparkling Lamp , 555 Delay Circuit and Astable Multi-vibrator, Delay Turn-Off Circuit OPA Astable Multi-vibrator, TTL and OPA Crystal Oscillator  Digital Circuits , BCD Adder and Sub-tractor, Mono-stable and Alarm Circuit  Touch Switch and 4518 Counter , LCDM and Digital Display Circuit, Signal Process Circuits, R-2R Ladder Network, A/D and D/A Converter , Low-pass, High-pass, Band-pass and Band-stop Filter , Regulator DC Power Supply, 7805 and 7905 Regular Characteristics , 7805 and 7905 Expanded Voltage, 7805 and 7905 Variable Regulator 7805 and 7905 Current Source , LED & Transistor Application Circuits, Electrons Competition-answer Machine , Basic Remote Lamp Controller (DC) Remote Lamp Controller (AC), Electronic Wheel-amusement Machine , Function Generator and DC Power Supply , Waveforms: Sine, Triangle, Square, TTL Pulse Amplitude: >10Vpp, Impedance: 50Ω, ± 10% or better, Duty Control: 30% ~ 60%, Display: 6-Digit LED or higher, Frequency Range: 10Hz ~ 100 kHz (4 Ranges), Frequency Range: 100Hz ~ 1 MHz (4 Ranges), Constant Voltage Output: ± 5V, ± 12V Variable Voltage Output: 0V ~ ± 15V, Power source: 220~230V AC, 50Hz, 1 Phase; Accessories: Connecting cables, Short jumpers, Adapter and Instruction manual; reputed brand; Identification mark: barcode; Warranty: 1 (One) year with services, Catalog should be submitted;