Check the listing for details. NE555 Pulse Frequency Square Rectangular Wave Signal Generator Stepper Driver. Condition: New. Listed at 6.98 USD. Package: 1 NE555 Pulse Frequency Module Performance: 1.Input Voltage: 5V-15VDC. when power supply is 5V , the output current can be 15MA around;when 12V power supply, the output current can 35MA around; 2.Input current: >=100MA; 3.Output amplitude: 4.2V V-PP to 11.4V V-PP. (Different input voltage, the output amplitude will be different) 4.Maximum output current: >=15MA(5V power supply, V-PP greater than 50%),>=35MA(12V power supply, V-PP greater than 50%) 4.Output with LED indication(low level ,LED will on; high level,LED will off;low frequency, the LED flashes); 5.The output requency range is selectable: LF file: 1Hz ~ 50HzIF file: 50Hz ~ 1kHz High-frequency file: 1KHz ~ 10kHz HF file: 10kHz ~ 200kHz 5.Cycle T=0.7 (RA+2RB) C(RA, RB for 0-10K adjustable); Low frequency:C=100UF;Intermediate frequency:C=1UF; M-Hfrequency:C=0.1UF;High frequency:C=0.001UF, Note: Before changing the frequency, please power off Application: 1. Used asa square wave signal generator,offer thesquare wave signal for the use of the experimental development. 2. Used to producedriving stepper motor drives, offer thesquare wave signal. 3.Adjustable pulse for the use of MCU. 4. Generate adjustable pulsecontrol circuit. Parameters: Product name: NE555 pulse module Product size: 31.0 mm * 31.0 mm * 15.0 mm (l x w x h) Colours:RedPackage Weight::7.52g/pcs Materials: FR4 + electronic components Contact Us (1) We strive to provide the best service as possible, commit to resolve all problems and give fast shipping. (2) Please contact us before giving any negative feedback. If you have any questions, please do not hesitate to contact us. Payment (1) All payments must be prepaid and cleared. (2) We only accept Paypal payment. After checkout, please make through Paypal service. Shipping (1) Buyer is responsible for any incorrect address and undeliverable address. We reserve the right to charge the shipping fee again for returned items due to wrong address. We take the paypal address as your shipping address. Please make sure your shipping address is correct during check out. (2) Your order will be shipped within 24 hours after payment is cleared (Sat. & Sun. excluded and holidays) (3) We ship orders using USPS (United States Postal Service). The shipment usually takes 2-4 business days, excluding holidays, Saturday and Sunday (4) Local pick up is not available. (5) No International Shipping. Warranty (1) This product has a 30-day warranty. (2) Warranty does not extended to any products that are buyer's negligence, abuse, misuse, improper installation or physically damaged on the buyer or user's part. (3) Please contact us before making a replacement or refund. (4) In case of returning, buyer must pay their own postage and shipping fees for replacement or refund. We will provide replacement or refund after product is received.