From the left:
Toggle the relays one by one.
Each relay toggled, doubles the frequency.
My other designs:
Colpitts Oscillators
http://everycircuit.com/circuit/6472095956729856
Binary LC Filter Bank Oscillator
http://everycircuit.com/circuit/5849640909144064
RF Up and Down Mixing
http://everycircuit.com/circuit/6321309163454464
DC Motor Rev. Sliding Mode Controller
http://everycircuit.com/circuit/5398415189213184
DC Motor Revolution Detector
http://everycircuit.com/circuit/6753368923176960
Amplitude Modulation and Demodulation
http://everycircuit.com/circuit/5510207106187264
Boost SMPS Unlimited Voltage Build Up
http://everycircuit.com/circuit/6448454909034496
High Power Charge Pump w. Mosfets
http://everycircuit.com/circuit/5016778832084992
Transformerless 230 Vac to 10 Vdc
http://everycircuit.com/circuit/4981362800197632
Motor Revolution Controller
http://everycircuit.com/circuit/6424781689978880
Motor Current Sliding Mode Controller
http://everycircuit.com/circuit/5502940846751744
ΣΔ ADC w. Result Displayed
http://everycircuit.com/circuit/4549196269223936
300W Class D Amplifier w. Mosfet output
http://everycircuit.com/circuit/5452375043342336
Three Phase Star Δ Safe Relay Wiring
http://everycircuit.com/circuit/4748634531037184
Accidental 555 High Voltage Generator LOL
http://everycircuit.com/circuit/5057154477457408
