Thursday, September 25, 2014
Enhanced Fishing Aid Equipment Circuit
This enhanced fishing equipment circuit provides audible and visible warning when a fish is nibbling the bait.
Although this event is fairly easy to signal with electronic means, the circuit is relatively extensive to ensure that it can be powered from a 9 V battery. The circuit is based on a slotted opto-coupler Type CNY37, and a home made notched wheel. Unfortunately, the current am- plification of slotted opto- couplers is very low (0.02 min.), requiring considerable current to be fed through the LED before a usable collector current flows in the phototransistor. To avoid rapidly exhausting the battery, MMV1 pulses the LED at about 250 Hz and a duty factor of 0.05. MMV; detects the presence of these pulses.
When a fish pulls at the bait, the notched wheel revolves in the slot, and intermittent pulse bursts are received at the trig- ger input of MMV; Green LED D1 lights, buzzer Bz beeps, and bistable N;-N4 is set, so that red LED D; flashes at a l.5 Hz rate. D1 and the buzzer are turned off when the fish gets off after nibbling the bait, but D; continues to flash. The circuit around Ni, T; and Ca then serves to keep the current consumption as low as possible. The circuit can be , reset by pressing S1. i Preset P1 enables adjusting the frequency of the buzzer oscillator between 600 and 2500 Hz. When several fishing-rods are being used, each can be assigned a particular signal tone. The buzzer can be switched off by means of S;. A suggested construction of the light barrier and the notched wheel is shown in Fig. 2. A small shaft is used in combination with a reel around which the fishing line revolves.
The slots cut into the detection wheel should not be too wide: l mm is a good starting value. The detection sensitivity is determined by the number of slots in combination with the reel diameter. The light barrier should be screened from day- light. In the stand-by condition, the circuit consumes no more than 4 mA, which goes mainly on account of the LED in the opto-coupler. In the actuated state, the current consumption rises to about 12 mA.
Although this event is fairly easy to signal with electronic means, the circuit is relatively extensive to ensure that it can be powered from a 9 V battery. The circuit is based on a slotted opto-coupler Type CNY37, and a home made notched wheel. Unfortunately, the current am- plification of slotted opto- couplers is very low (0.02 min.), requiring considerable current to be fed through the LED before a usable collector current flows in the phototransistor. To avoid rapidly exhausting the battery, MMV1 pulses the LED at about 250 Hz and a duty factor of 0.05. MMV; detects the presence of these pulses.
When a fish pulls at the bait, the notched wheel revolves in the slot, and intermittent pulse bursts are received at the trig- ger input of MMV; Green LED D1 lights, buzzer Bz beeps, and bistable N;-N4 is set, so that red LED D; flashes at a l.5 Hz rate. D1 and the buzzer are turned off when the fish gets off after nibbling the bait, but D; continues to flash. The circuit around Ni, T; and Ca then serves to keep the current consumption as low as possible. The circuit can be , reset by pressing S1. i Preset P1 enables adjusting the frequency of the buzzer oscillator between 600 and 2500 Hz. When several fishing-rods are being used, each can be assigned a particular signal tone. The buzzer can be switched off by means of S;. A suggested construction of the light barrier and the notched wheel is shown in Fig. 2. A small shaft is used in combination with a reel around which the fishing line revolves.
The slots cut into the detection wheel should not be too wide: l mm is a good starting value. The detection sensitivity is determined by the number of slots in combination with the reel diameter. The light barrier should be screened from day- light. In the stand-by condition, the circuit consumes no more than 4 mA, which goes mainly on account of the LED in the opto-coupler. In the actuated state, the current consumption rises to about 12 mA.
